Thailand

Availability
Three main mobile operators of Thailand ("big three") - AIS, DTAC and True Move. Also there is a number of smaller providers or MVNOs that lease government bandwidth mostly on the CAT network (such as i-Mobile, Tune, Penguin or My).

Purchase of a new SIM card/number is easy, and can be done at operators' shops or at any 7-Eleven and many airport kiosks. Thailand has started mandatory SIM card registration and now you need to provide your ID or passport at the points of purchase.

Arriving at BKK (Suvarnabhumi) airport in Bangkok, you have the best choice. The 3 major players have their flagship stores in the big arrivals hall just past the customs check almost side by side. There you can compare prices and promotions. In Suvarnabhumi, there are several 3rd part phone shops near the elevate train entry point at the lower level.

The situation at DMK (Don Mueang) Bangkok's budget airport has been changed. You can now find the stores of the three major providers located next to each other facing exit gate 6. At Phuket and Chiang Mai airports you may find stalls of the providers giving out reduced SIM cards too.

Alternatively, SIMEasy resells some Tourist SIMs of True and AIS for a substantial surcharge (33% compared to local prices), but include worldwide delivery in that price. As their choice is rather limited so far, they are only recommended, if you need to know your phone number in advance.

Concerns for all providers
The big three operators have SIM cards for all sizes - normal, micro and nano SIMs. Normally micro SIM cards can be popped out from a normal SIM card, but nano SIMs are sometimes sold separately. It's recommended to specify which SIM card size you need when buying.

All major operators allow tethering and they treat all data going through their network equally. If you are using an iPhone, you may need to perform a network reset or a carrier update for the mobile tethering option to appear. Tethering provides, most of the time, excellent quality It is sufficiant for VoiP and supports PPTP/SSL/IPsec VPNs. If you work remote and are a heavy user, you will have a trouble free experience.

For voice calling overseas heavily reduced rates even below VoIP providers are offered by the three major operators using special IDD prefix codes. Let them give you the cheapest option for your destination which has to be dialed before the country code (see below).

Topping up
Adding credit or airtime is quite easy in Thailand. Loading airtime gives you ability to make calls or subscribe to data packages and also extends SIM card lifetime. A few physical places where you can top-up: 7-Eleven, Family Mart, BigC, Tesco, phone kiosks and the outlets of the operators.

Adding credit online is also possible and there are some options: There are a lot more resellers found on the internet, all using the same API and provider. If one of them does not work with your number and payment option, trying another one will most likely give you the same error.
 * MobileTopup.com accepts international and local Visa and MasterCards with small surcharge.
 * If you have Bitcoins you can top-up at https://www.bitrefill.com or http://bitcoins.com.th
 * If you use Webmoney you can do it through wm-thailand.com. Most of these options add face value surcharges, and conversion fees may be added in the process. They remain mostly limited to the 3 major providers.
 * For developers, there is also a API service.

Expiration policy
You have to top-up a Thai SIM card every 45 days or pay more to add validity in order to keep it alive as well as make at least one call or outgoing SMS activity every 6 months. Normally, Thai SIM cards expire in 45 days after the last top-up, unless you are able to add extra validity. The bare minimum to maintain validity is 10 Baht every month. True and DTAC allow you to extend validity for a price, check this site on how to extend.

Network compatibility
Before you purchase any SIM card, make sure that the network you are choosing is compatible with your devices (see below). The big three providers have different networks operating on more than one set of frequencies that are combined through domestic roaming. So you should better enable roaming on your device, even for domestic use. Most old networks mainly on 2G are about to decommissioned soon. These frequencies are used for 3G and 4G/LTE:
 * AIS has 3G/DC-HSPA on 900 and 2100 MHz (and roaming on TOT 2100 MHz) and started in 2016 with 4G/LTE Advanced called "4.5G" on 1800 and 2100 MHz (bands 1 and 3)
 * dtac has the largest 3G spectrum: 3G/DC-HSPA on 850 and 2100 MHz and 4G/LTE on 1800 and 2100 MHz (bands 1 and 3)
 * TrueMove H has 3G/DC-HSPA on 850 and 2100 MHz 3G/DC-HSPA and the largest 4G/LTE spectrum on 850, 900, 1800 and 2100 MHz (bands 1, 3, 5 and 8)
 * CAT: is on 3G/HSPA only on 850 MHz (with national 4G roaming for its My brand on True's 4G/LTE network on 1800 and 2100 MHz).
 * TOT: is on 3G/HSPA on 2100 MHz in Bangkok only (nationwide through 3G roaming on AIS) and plans 4G/LTE on 1800 MHz 4G/LTE (B1) and 2300 MHz TDD-LTE (B40).

For 4G/LTE in 2016: True has the best coverage at 90% of population, followed by dtac that now covers all 77 provinces today but lacks coverage, while AIS has only started to roll out 4G, partly as "4.5G" with carrier aggregation and is about to cover 80% by the end of 2016.

Note that all old 2G/GSM networks are about to be shut down within the next years as the providers need more spectrum for LTE. AIS has sealed a roaming agreement with dtac for 2G on their 1800 MHz band, which dtac is going to use until 2018. True has leased back bandwidth from CAT on 1800 MHz for 2G until the end of 2016 while TOT has never had any 2G. So be prepared that 2G is coming to an end soon in Thailand and better bring a 3G or 4G/LTE device even for voice calls.

Coverage and speed
The crowdsourced Open Signal report from Nov. 2017 on Thailand showed that the leading trio is very much on par. 4G/LTE availability was generally high with >90% on all three networks throughout the country, while average 4G speeds ranged from 8 Mbps on dtac, 9 Mbps on AIS to 11 Mbps on TrueMove.

IDD Calling Prefixes
Thailand is one of the few countries where some international calls are charged lower than domestic or even VoIP calls. For this you have to use certain IDD prefixes. So the correct order to dial abroad is:  The prefixes differ between operators and are added at the end of each section. The major providers give out special discounted prefixes on which major landlines in Europe, America, Asia and Australia can be called for as low as 1 THB per min. On all operators you can use CAT's prefix 009 (price list) or TOT's 008.

New biometric registration (effective 15/Dec/17)
Under the law all SIM cards have to be registered from 2015. You will need to show an ID at the point of purchase. This is now enforced in all providers stores and outlets very strictly and from the end of 2017 a new biometric system is introduced. You will now additionally have your face scanned or fingerprints taken.

The new system is mandatory from 15 Dec. 2017 to the registration of both new prepaid and postpaid SIM cards, but not to existing SIM card holders. It's to be used across Thailand in all 55,000 customer service shops and outlets. Operators can choose to use either the face or fingerprint recognition verification system.

The number of new SIM cards sold by all three major mobile phone operators that are ordered to introduce this new biometric registration system is around 4.2 million units monthly. Under the previous method, the registration locations copied only the ID cards of the SIM card buyer together with a barcode of the purchased SIM card.

Under this new method, new SIM card subscribers will have to insert their ID cards into the fingerprint reader or the face recognition card reader at the registration locations. The card readers are connected to the mobile phones or PC of the registration locations. In the case of the face recognition system, the locations will take the SIM card users’ face with the mobile phones embedded with an NBTC registration application. Then the app will see, if the captured face matches with the face stored in the ID card database. Foreigners buying SIM cards in Thailand will have their faces scanned and matched against their passport photographs.

In 2018 new restrictions on the number of SIM cardshave been implemented. Users can from now on only buy up to 5 SIM cards from one mobile provider, which then must be registered via the country’s biometric verification system (a face recognition or a fingerprint verification).

WiFi
Thailand has a very strong network of public WiFi hotspots all over the country. Some of them e.g. in airports are free and publicly available. Others in hotels and restaurants are for customers only. There are many hotspots of AIS, True and dtac throughout the country. If you purchase a SIM, also check for the accompanying wifi plan. In general monthly plans over 500 Baht per month will include free wifi package. Wifi plans can be purchased separately as well, and paid from your phone balance. While True has the largest WiFi presence, AIS has the largest roll out of the latest 802.11n WiFi points, and generally has better speeds and reliability.

'''Most prices below are without taxes. Add 7% tax for the final price.'''

AIS (1-2-Call, you! Mobile)
AIS has the largest 2G/3G network with a 50% customer share. It's part of the SingTel Corp. that also owns e.g. Optus in Australia and SingTel in Singapore. Surprisingly, AIS was the last major provider to start 4G/LTE in 2016 on the 1800 and 2100 MHz band, partly marketed as "4.5G" or LTE Advanced. It now covers 80% of the population in 2017: 3G/4G coverage map and is competitive to True and dtac.

AIS operates two different prepaid brands called the more common 1-2-Call and the rare '''you! Mobile'''.

Availability
You can get their SIM cards online (only for old 3G SIMs) to be sent to a Thai address and at airports, major shopping malls, telecom stands, in AIS and Telewiz branded stores (shop locator in Thai with map). Change language of their messages to English by pressing *700# and choose option 5.

Top-up, balance check and validity
Top-ups can be done in many ways, but ATMs and internet banking require Thai bank accounts. So topping up by an electronic top-up or cash card is recommended. They are sold at some convenience stores such as Family Mart, Tesco/Lotus, Big C or online. 7/11 stores do not sell Top-ups any more, but all have an orange machine outside wich will allow you to use cash to top up. A small fee will be deducted.

Every AIS store has a "payment kiosk" that is an automated top-up machine as well. These green/white machines are also found at malls and MRT/BTS stations, and are the fastest option to Top-up. There is no markup, 500 THB in gives you 500 THB credit.

Top-ups can also be made by credit card on the AIS service page in increments of 50 THB. International credit cards are a mixed bag, most of them do not work.

Top-ups up to THB 150 are valid for 30 days and of more than THB 150 are valid for 60 days. In case there is no usage or no recharge for 90 days, with no remaining validity, the number will be automatically terminated.

To maximize validity extension, top up in small increments e.g. For THB 500 credit, top up THB 100 5 times and the validity will be extended 5 times instead of once with a single THB 500 top-up.

To top-up by code, type *120*<16 digit voucher PIN>#. To check account balance and validity, type *121#. Check data balances by *121*3#.

1-2-Call
1-2-Call SIM cards are their regular prepaid voice and data cards. All new SIM cards include 4G/LTE are sold for around THB 50 with a THB 15 call credit and some bonuses. They offer a huge array of SIM cards:
 * The One SIM: This SIM was introduced in February 2018 as often a specific SIM can't be found. You can simply make this SIM either a Super Play, Super Social, Easy Free Net or 4G Net SIM (all see below). When you top-up at least THB 150 you get 1 GB 3G/4G data and 1 GB 4G-only data for 7 days, 3 GB WiFi and 1 GB for social apps for 30 days as a bonus.


 * Super Play: This is one of their most common prepaid cards available when or where no other SIM is sold. When you top-up at least THB 150 you get 1 GB for 7 days and 3 GB WiFi for 30 days as bonus.
 * Super Social: This SIM is geared to social media. For a top-up of at least THB 150 you get unlimited use of Facebook, Facebook Messenger, Line, Twitter, WhatsApp, Viber, WeChat, BeeTalk at 1 Mbps for 30 days, 1 GB 3G/4G data and 1 GB 4G-only data for 7 days and 3 GB WiFi for 30 days as bonus.
 * Easy Free Net: This SIM is for "internet beginners". You get unlimited slow internet at 64 kbps, 150 MB high speed data and a THB 15 call credit.
 * 4G Net SIM: This is their best SIM for data-use. It's sold for THB 88. After activation you get unlimited internet at 1 Mbps and WiFi valid for 7 days. The weekly fee is THB 88 automatically charged every 7 days. If the account balance is insufficient for weekly fee, speed will be throttled to 64 kbps for 7 days after the period Internet usage will be stopped until account balance is sufficient for weekly fee. Regular and special Net SIM packages (see below) can be added.
 * Zeed: This SIM is targeted to teens and has been one of their best plans, but seems to be faded out. On activation, it includes 500 MB of data, and 2 GB of YouTube data for 1 month. It also includes AIS Super WiFi. These data allowances renew for future months if you top up at least THB 100 per month. However, this SIM is very difficult to find, and may be sold by shops at a mark-up over face value (e.g. 99 THB rather than 50 THB).
 * Net Marathon: These are preset SIM cards with unlimited data for 6 or 12 months at defined speeds:
 * for 6 months @ 1 Mbps: THB 600, @ 4 Mbps: THB 1400
 * for 12 months @ 1 Mbps: THB 1200, @ 4 Mbps THB 2500
 * Zodiac SIM: This SIM comes in 12 different zodiacs. It's sold for THB 99 and contains 500 MB data and WiFi for 7 days and another 1 GB data as bonus if you top-up at least THB 150.
 * Others: AIS has some other SIM cards, but most are probably not of interest to visitors like one with your zodiac. Their tourist SIM called Traveller SIM and their roaming SIM called One2Fly are featured further below in the article.

Data packages
AIS has a rather large and confusing range of data add-on packages (in addition to their many SIM card types, some of which already come with data). These data packages on up to 4G/LTE can be activated on all their SIM cards from above (add 7% taxes). This table is a survey of available data add-ons called MaoMao packs and their activation codes all open to 4G/LTE giving max. speed: For higher resolution click on the table. Beware using monthly (auto-renewing) packages marked in blue that you will lose the original benefits of the SIM. For all prices add 7% tax.

Furthermore, some throttled weekly packages are sold with "unlimited data" in different speeds: Social media users can add these pack with auto-renew (no VoIP calls):
 * @ max. 384 Kbps: 79 THB, activation: *777*7072#
 * @ max. 512 Kbps: 89 THB, activation: *777*7009#
 * @ max. 1 Mbps: 99 THB, activation: *777*7098#
 * @ max. 4 Mbps: 150 THB, activation: *777*7154#
 * @ max. 6 Mpbs: 189 THB, activation: *777*7210#
 * for unlimited Facebook, LINE and WhatsApp for 7 days: 49 THB, activation: *777*791#

Net SIM packages
Their Net SIM is focused on data, but has voice and text too at a higher price. Only this SIM has special packages for data including unlimited AIS (Super) WiFi: The higher values in brackets refer to the first 6 months of NetSIM only. Volume will be cut down from the 7th month. All packages auto-renew. You can add regular packages too, but need to stay on the monthly base plan.
 * 2 GB per week, free AIS Super WiFi: 99 THB (default rate)
 * 1 (1.5) GB per month: 299 THB, *777*3002#
 * 2 (4) GB per month: 399 THB, *777*3003#
 * 3 (6) GB per month: 499 THB, *777*3004#
 * 5 (10) GB per month: 699 THB, *777*3005#
 * 8 (14) GB per month: 899 THB, *777*3006#
 * 14 (22) GB per month: 1099 THB, *777*3007#

Tourist SIM: AIS Traveller SIM
Alternatively, AIS offers their Traveller SIM to visitors in three starter packs: All data beyond the quota is throttled to 64 kbpts. On all Traveller SIMs the cheap IDD prefix 00300 gives calls to some destinations like Germany or China at 1 THB per min. For more countries use 003 prefix for reduced call rates.
 * for 49 THB: no data pre-loaded, 15 THB call credit at AIS shops and retailers. You need to add a package which will be throttled to 384 Kbps
 * for 299 THB: 1.5 GB data for 8 days, 100 THB credit for 30 days validity at major airport stores, other AIS stores and Family Mart nationwide.
 * for 599 THB: 6 GB data for 15 days, 100 THB call credit for 30 days at AIS stores nationwide.

The default data rate outside packages is 2 THB per MB. These add-ons are advertised for the Traveller SIM (tax incl.), but in fact you can add any regular package shown above too: When used up, max. speed will be throttled from 42 Mbps to 64 kbps. For WiFi an 1 hour usage period is counted from log-in and log-out time. The username and password received via SMS is valid for 24 hours.

AIS WiFi passes
AIS has many hotspots, especially in shopping malls and airports. WiFi packages are available as follows: You will need to purchase any AIS SIM card (for 50 THB) in order to buy a WiFi pass. The 99 THB package enables additional access to AIS Super WiFi, which has superior speeds (tested up to 150/150 Mbps in real world use) compared to the normal WiFi (capped at 10/1 Mbps).

Some SIMs and packages come with WiFi; to obtain the password dial *388*1# or get it online.

Roaming SIM: SIM2Fly
The AIS SIM2Fly was originally meant for outbound Thai tourists, but is now being distributed throughout the region, because it offers quite good roaming rates. The SIM2Fly SIM card comes in 2 types: The Asian version comes with 4 GB roaming data at 3G and 4G/LTE speeds and is valid for 8 days in China, Japan, South Korea, Singapore, Malaysia, Hong Kong, Laos, India (in certain states only), Taiwan, Macao, Philippines, Cambodia, Myanmar, Australia, Nepal, Indonesia, Qatar and Sri Lanka.
 * 399 THB: SIM card for certain countries in Asia and Australia
 * 899 THB: SIM card for certain countries in Europe and the Americas

After the main package has expired, you can add a new data package. For more data you can use following codes to extend your data package: As the data package is 100 THB less then the price of a new SIM card, it may be worthwhile to keep your SIM active. You can extent the validity by various methods listed here. AIS SIM2Fly can be found for sale all over SE Asia. Some online shops are selling SIM2fly SIM cards to foreign countries for a surcharge and delivery fees. To top-up from abroad you can use https://mobiletopup.com/ (5% fees apply for credit card payments and amounts start at THB 50) or other agencies that can charge up to 30% fees.
 * 1 GB valid for 2 days: 119 THB, activation by *111*356#
 * 4 GB valid for 8 days: 299 THB, activation by *111*354#

Be aware of the annoying top-up rules of Thai SIM cards: Every top-up extends validity for another 30 days. To maintain a validity of one year, you need to top up ridiculous 12 times. Minimum top-up fee is 10 THB, but most international agencies start at 50 THB only. This can make the deal much less attractive for occasional users. But it remains a good option, if you buy and load it in Thailand for an onward journey through certain countries in SE Asia (with some destinations like Vietnam or Laos still missing).

you! Mobile
you! Mobile is a sub-label of AIS launched in 2014 and by 2018 can be considered to be a failed effort that is no longer promoted. You'll get 100 THB bonus if you subscribe to your account here and top up at least THB 50 for the first time.

you! Mobile allows customers to set their voice and internet data package by themselves on their online account, and gives them the flexibility to swap between the two elements in order to receive the best value for money based on their individual needs and usage. All packages need to be booked online on your account. All codes of AIS 1-2-Call apply on you! Mobile too.
 * you! Design: online you need to set your monthly allowance data (and optional voice):
 * 99 THB - 260 MB
 * 200 THB - 600 MB
 * 400 THB - 1.9 GB
 * 600 THB - 3 GB
 * 800 THB - 4.3 GB
 * 1,000 THB - 6 GB
 * you! Swop: you can change minutes online into data or data into minutes. Exchange rate: 1 minute = 2.7 MB
 * you! Topping: add-ons for extra data (or minutes):

More information

 * IDD prefix: 003 (quality) or 00300 (budget on some plans like Traveller SIM, from THB 1 per min)
 * APN: internet


 * Websites (in English): for AIS 1-2-Call, AIS WiFi with manual and you! mobile

dtac
dtac for Total Access Communication is Thailand's 3rd largest network by the number of users. It's partly owned by Telenor group from Norway and is the network that owns the biggest wireless bandwidth in the country. Its prepaid brand is called Happy. 4G/LTE started in 2014 on 2100 MHz in Bangkok only and has been expanded in 2015 to Phuket and Pattaya and another 40 cities nationwide: 4G coverage map. In 2015 4G/LTE was started in the metro Bangkok area mostly on the additional 1800 MHz frequency which is much more common internationally. In June, 2018 DTAC started offering 4G+ on the 2300 MHz frequency thru a deal with TOT.

Availability
You can get their SIM cards from almost any shop including at the airports, but if you prefer, you can obtain it directly from their stores. All new SIM cards are 4G SIM cards now and are sold for 49 THB.
 * Go Plearn SIM: comes with free basic internet at slow 64 kbps for lifetime (from other SIMs change by *103*55*9# for 30 THB)-


 * Super 4G SIM: comes with free YouTube streaming at night (midnight-8am), zero-rated music streaming through the Music Infinite app and 1GB per month for 7 days up to 12 months when top-up at least 150 THB per month (press *103*333*9#).
 * Social Hero SIM: is for social media users. It comes with free use of Facebook, WhatsApp, Instagram, Twitter, Line, WeChat, BeeTalk, Pantip and Kakao for 30 days being extended to a year when you top-up at least 100 THB per month. 1 GB data for 7 days @ 42 Mbps being extended to a year when top-up at least 150 THB per month (press *103*333*9#).
 * Other SIMs: Some other SIMs are sold too without or different benefits and promotions.

Data plans
Default rate for data is on all prepaid SIM cards 1.99 THB per MB.

For the so-called Non-stop Internet Plans below, you get connection at full 4G speed up to 100 Mbps for a certain amount of data, then your speed will be capped at the stated fair use policy (FUP) maximum speed which is varied respective to the plan you choose (but you can use them as much as you like, they are unlimited after all). Default rate is 1.99 THB per MB outside of packages. Daily packages are once-off and don't renew, weekly and monthly packages auto-renew.

For monthly plans only, these Speed Toppings can be added: For the plans that include WiFi, you must first obtain your username and password by dial *4000# and then you can connect any of your device (can be your laptop or a tablet) to all dtac Wi-Fi hotspots. The WiFi usage is unlimited. Dtac WiFi can be found mostly in shopping centres and airports.
 * 100 MB for 1 day: 5 THB, activation: *104*308*9#
 * 1 GB for 30 days: 150 THB, activation: *104*50*#

These add-ons can be used for social media (for not being debited from your general data account): For light data users, dtac has Lite Packages that are reduced in speed from the beginning: All overuse is at 64 kbps for the rest of the period. Check balance in packages by *101*1*9#.
 * Facebook for a day: 5 THB, *104*405*9#
 * Viber for a day: 5 THB, *104*600*9#
 * WhatsApp for a week: 19 THB, *104*88*9#
 * Line for a week: 19 THB, *104*421*9#
 * Facebook, Instagram, Twitter and Line for a day: 7 THB, *104*671*9#

WiFi passes
For dtac WiFi, when not included in your data pack, special passes are sold: Data is unlimited on the WiFi. For your password dial *400*9#.
 * 19 THB: 1 hour, activation: *104*619*9#
 * 39 THB: 24 hours, activation: *104*639*9#
 * 69 THB: 30 days, activation: *104*669*9#
 * 99 THB: 30 days including 3BB WiFis, activation: *104*699*9#

Asia roaming offer
For cheap data roaming dtac offers new "roam like home" packages with unlimited data on Metfone in Cambodia (Metfone), Malaysia (digi), Myanmar (Telenor), Australia (Telstra) and Taiwan (Chunghwa Telecom). 1 day (= 24 hours) for THB 280, 3 days for THB 840 and 5 days for THB 1,450. Activation is done online through your account and starts immediately.

Tourist SIM: Happy Tourist SIM
dtac also sells SIM cards with short validity and "unlimited" data for tourists. The SIM card is called Happy Tourist SIM. It comes in 4 varieties of starter packs and is on 2G/3G/4G: Excess data is charged at 2 THB per MB. You can actually buy their Tourist SIM online here and get it shipped overseas for a whopping THB 350 surcharge worldwide. You can also find the Tourist SIM on Amazon.com to be sent abroad. These add-on packages are sold for the tourist SIM:
 * Happy Tourist SIM 49: 49 THB, with 15 THB credit included valid for 35 days
 * Happy Tourist SIM 199: 199 THB, "unlimited" internet (FUP: 500 MB) for 7 days
 * Happy Tourist SIM 299: 299 THB, 100 THB credit included valid for 35 days and "unlimited" internet (FUP: 2.5 GB) for 8 days
 * Happy Tourist SIM 599: 599 THB, 100 THB credit included valid for 35 days and "unlimited" internet (FUP: 5 GB) for 15 days
 * 229 THB: 1 GB, 30 minutes for 3 days, activation: *104*581*9#
 * 299 THB: 2.5 GB for 10 days, activation: *104*553*9#
 * 699 THB: 6 GB for 20 days, activation: *104*344*9#
 * 799 THB: 9 GB for 30 days, activation: *104*343*9#
 * validity extensions:
 * 50 THB for 180 days
 * 100 THB for one year

Roaming SIM: SIM GO!
Similar to AIS' SIM2Fly dtac offers a special SIM called SIM GO! for roaming only in China (China Mobile), Hong Kong (SmarTone), Macau (Hutchison Three), Taiwan (Chungwha Tel.), Singapore (Starhub), Malaysia (digi), Indonesia (XL), Laos (Unitel), Myanmar (Telenor), Cambodia (Metfone) and Australia (Telstra).

The SIM is for 399 THB and includes 4 GB for 10 days starting from activation. Beyond 4 GB speed will be throttled to 128 kbps for the rest of the time. It can't be extended in time. Unlimited internet @ 4 Mbps in Thailand for 6 hours is added, when SIM is activated before departure. For making calls and sending SMS you need to top-up. This SIM is only available in Bangkok in some major stores mentioned here. VoIP is banned and APN should be set to 'internet'.

More information

 * IDD prefixes: 004 (quality) or 00400 (budget only on the Tourist SIM, starting at 1 THB per min for many countries)
 * APN: www.dtac.co.th
 * Website: dtac smartphone SIM, dtac data packs

TrueMove H
TrueMove H is Thailand's 2nd largest network and the most heavily advertised. TrueMove is part of the larger True Corp. conglomerates, owned by CP Group which is the biggest retailer owning all 7-Eleven and Tesco stores in Thailand.

They were the first provider in to bring 4G/LTE on the rare 2100 MHz to Thailand. Its 4G/LTE coverage is the best so far in the country and comprises 80% rising to 96% by the end of 2016: 4G coverage map in Thai and list in English. In 2015 the much more usual 1800 MHz band was added for 4G/LTE as well as 850 and 900 MHz in 2016. As 3rd placed network, their offers are generally 5-10% cheaper then those of AIS or dtac, but their 2G/3G coverage is a little lower too.

TrueMove and TrueMove H are two different networks (both owned by the same company). TrueMove is no longer allowed to sell their SIM cards as their license has expired. Customers from the existing TrueMove networks are being transferred to the new TrueMove H. Keep roaming enabled on your mobile as some devices will consider it a roaming network.

Availability
You can get their SIM cards from almost everywhere, but you should obtain it directly from any of the True Corp. stores (including True Online and True Visions stores) or 7-Eleven kiosks. Electronic top-ups are sold at all 7-Eleven stores or Family Mart. There, you have to know and enter your number. Most of their SIM cards are 4G/LTE enabled now, but there are some old 3G SIMs still around.

When you arrive at BKK airport, you should check their promotions at their store in the arrivals hall at concourse A, 2nd floor, opposite Gate 5. They offer often promotions that are not available otherwise and are mostly for starting-up and the first package only. You may also see their free SIM stand at the airports in Chiang Mai or Phuket.

3G packages
You can simply get one of their prepaid SIM cards and add from their big variety of data packs. For the "unlimited" internet plans below, you get connection at full speed for a certain amount of data, then your speed will be capped at the stated fair use policy (FUP) maximum speed which is varied respective to the plan you choose.

For the plans that include WiFi, you must connect to the @TRUEWIFI hotspots (not the .@TRUEWIFI) and then log-in using your phone number. They have the biggest WIFI network with more than 100,000 hotspots: Hotspot Locator must also log out after you finish. These packages are offered on 2G, 3G and WiFi for prepaid (add 7% taxes): Speed is up to 42 Mbit/s on 3G. Most packages auto-renew. As they can't be canceled easily, better add extra packs for more data:
 * 59 THB: 500 MB for 7 days, *900*8923#
 * 79 THB: 1 GB for 7 days, *900*8924#
 * 99 THB: 1 GB for 15 days, *990*8925#
 * 150 THB: 1 GB for 30 days, *990*8903#
 * 199 THB, 5 GB for 30 days with auto-renewal, *990*8813#
 * 299 THB: 10 GB for 30 days with auto-renewal, *990*8814#

4G/LTE packages
Most of their SIM cards are now 4G/LTE enabled and are sold for THB 0-49 with very little credit. Speed is up to 100 Mbps on 4G/LTE. Default rate outside package is 1.50 THB per MB. These 4G/LTE packages can be booked on all 4G SIM cards. For all prices add 7% taxes: Daily and weekly plans are once off and can be booked new anytime. All monthly plans auto-renew after 30 days. For more data on monthly plans, add one of these add-ons:
 * 179 THB: 1 GB, 30 days, *900*8936#
 * 279 THB: 2 GB, 30 days, *900*8937#
 * 379 THB: 3 GB, 30 days. *900*8938#

Tourist SIM: Tourist Inter SIM
TrueMove H sells special SIM cards for tourists too. The SIM card is called Tourist Inter SIM. In 2016 True's 4G/LTE has been opened for the tourist SIM. They come in 3 different starter packs:
 * 49 THB: with free True WiFi for 24 hours (access see below), 15 THB call credit for 30 days
 * 299 THB: with 3 GB data, unlimited True WiFi and 100 THB call credit for 8 days
 * 599 THB: with 8 GB data, unlmited True WIFi and 50 THB call credit for 15 days

To activate, type *123#. After the included bundle has expired or used up, you can add these top-up bundles:

Default data outside packs or for overuse is 1.5 THB per MB. These bundles above are officially advertised for the Tourist SIM. Unofficially, their regular 3G and 4G packs have sometimes worked in the past, so you might give them a try. However, effective 2018, this seems to be discontinued and all attempts to activate a regular bundle on a Tourist SIM seems to usually be denied.

WiFi packages
True has like dtac and AIS many WiFi hotspots throughout the country. They have the biggest WIFI network with more than 100,000 hotspots: Hotspot Locator. When not included in your plan, they offer these packages for a max. speed of 200 Mbps (add 7% taxes): To acquire your WiFi password dial *871*4# for free. The weekly and monthly packages auto-renew. More info about their WiFi.
 * for 1 day: 39 THB, activation: *900*82#
 * for 1 week: 59 THB, activation: *900*84#
 * for 1 month: 100 THB, activation: *900*83#

Asia roaming options
For roaming in other Asian countries, True has introduced new roaming packages with unlimited data on 3G networks:
 * for Singapore (Starhub) and China (China Mobile): 1 day, THB 99, *115*801#; 3 days, THB 295, *115*802#; 5 days, THB 490, *115*803 or 7 days, THB 680, *115*804#
 * for South Korea (KT, SK Telecom), Japan (NTT Docomo), Hong Kong (3, CSL), and Macau (3), as well as the US (AT&T) and Australia (Optus, Telstra): 1 day THB 150, *115*901#; 3 days THB 450, *115*902#; 5 days THB 750, *115*903#; 7 days THB 1050, *115*904#
 * for Indonesia (Telkomsel, Indosat Ooredoo) ,Laos (Lao Telec., ETL) and Malaysia (Maxis, Digi, UMobile): 1 day THB 320 *115*701#, 3 days THB 855 *115*702#, 5 days THB 1400 *115*703# or 7 days THB 1960 *115*704#
 * for 18 Asian countries: 1 day THB 333 *115*401#; 3 days THB 950 *115*402#; 5 days THB 1550 *115*403 or 7 days THB 2150 *115*404#

Roaming SIM: Travel SIM
Similar to AIS and dtac they sell a SIM for roaming in Asia only. Their Travel SIM Asia is for THB 399 that includes 8 days of 4G internet (throttled to 128 kbps after 4 GB) in Singapore, South Korea, Qatar, Cambodia, Taiwan, Hong Kong, Macau, Myanmar, Philippines, Malaysia, Indonesia, and China which can be extended: The SIM is activated as soon as it connects to a roaming network. Roaming in China is on China Mobile network, so check our China article for details on phone compatibility. However, like other roaming SIMs in China, data is not censored. The APN may need to be set manually to 'internet' and username/password 'true'.
 * for another 3 days/1 GB (hard cap) for THB 150 by *115*150#,
 * or another 8 days/4 GB (throttled to 128 kbps after) for THB 299 by *115*299#.

More information

 * IDD prefixes: 006 for quality or 00600 for budget (on the tourist SIM starting from 1 THB per min to major countries)
 * APN: internet - username and password: true
 * Website partly in English: http://truemoveh.truecorp.co.th/?ln=en
 * To change SMS notifications to English: Press *700, then 1 (For English), 5 (Change Language), 2 (SMS), 2 (English), 1 (Confirm)
 * or press 9304, then follow voice prompts to switch language between Thai and English.
 * check your remaining balance by 9302 (voice response) or *123# (SMS response).

My (by CAT)
My is a MVNO operated by CAT Telecom Public Company Ltd., the state-owned company that runs Thailand’s international telecommunications infrastructure, including its international gateways, satellite, and submarine cable network connections.

It's the 4th largest mobile network operator in Thailand and owns spectrum on the 850 Mhz frequency, rents it out to True Move. In return it can use 20% of the bandwidth for their own My by CAT operation and other MVNOs (see below). Towers and network are operated by True Move for their own 3G 850 Mhz. In 2016 they started national roaming with True for 4G/LTE. To all prices below add 7% taxes.

Frequencies and coverage
My has only 3G/HSPA+ on 850 Mhz (= B5) without fall-back to 2G. As My uses the same 850 MHz network as True Move, their 3G coverage is the same. By 2014 it had a coverage of approximately 97% of population and consisted of around 14,000 BTS. But as there are way less users on CAT's 20% share as they have roughly a market share including MVNOs of 1-2% so far.

Starting in 2016 they opened up 4G/LTE access by national roaming on the 4G/LTE 1800 MHz and 2100 MHz network of True Move.

Availability
My by CAT shops and CAT service centers are now showing up in some shopping malls (locator in Thai-English).

Top-up vouchers can be found at various locations like CAT stores, AJ Sabaidee top-up kiosks, U Top-up at Big C and postal offices, Tesco Lotus and 7-Eleven (only for THB 100 and 300). To top-up by code type *901* #. To check balance type *902#.

Data feature packages
Different base plans are offered for 3G and 4G/LTE roaming are offered. For data you can change to MY Net plan by *905*03# for free. It has the lowest default rate of 0.50 THB per MB. Check your base plan by *905*00#.

For short-time these packages are given out: These monthly plans on 3G and 4G/LTE roaming on True with full speed are offered: All packages are for 31 days, overuse is throttled to 384 kbps.
 * for 24 hours: 500 MB THB 19 - *906*146#, 1 GB THB 29 - *906*147#, 2 GB THB 39 - *906*150#, 3 GB THB 49 - *906*153#,
 * for 7 days: 1 GB THB 39 - *906*148#, 2 GB THB 49 - *906*151#, 3 GB THB 59 - *906*154#, 4 GB THB 69 - *906*156#
 * for 15 days: 1 GB THB 59 - *906*149#, 2 GB THB 69 - *906*152#, 3 GB THB 79 - *906*155#, 4 GB THB 89 - *906*157#
 * 1 GB: THB 199 - activation: *906*132#
 * 2 GB: THB 299 - activation: *906*133#
 * 5 GB: THB 399 - activation: *906*134#
 * 10 GB: THB 499 - activation: *906*135#
 * 15 GB: THB 599 - activation: *906*136#
 * unlimited 4G, 20 GB 3G: THB 899 - activation: *906*137#
 * unlimited 4G, 25 GB 3G: THB 1099 - activation: *906*138#

More information

 * IDD prefix for cheap foreign calls: 009 starting at THB 1.50 to some European, Asian countries and the US (list)
 * APN: internet
 * Website partly in English: http://www.mybycat.com/en/

Penguin SIM (on CAT)
In 2016 some new MVNOs started mainly on the CAT network. The most visible so far is Penguin SIM by White Space. It's aimed at the Thai youth, but accessible to everyone and heavily marketed at small street vendors and other places. It has certain pros and cons, you should be aware of. It's on the 3G-only CAT network (see above). While it has a good coverage identical to True's 3G footprint, it doesn't offer a 2G fallback or 4G/LTE and you need to have a device capable of 850 MHz in 3G.

Penguin SIM has very low prices, but most of their rates are severely throttled. That means that they can be good for messaging like LINE (preferred messenger in Thailand) or basic internet, but inconvenient for browsing websites. All of their publications are in Thai only. To all the given prices below add 7% taxes.

Availability
All their SIM cards are sold for THB 49 with THB 20 credit when you top-up THB 50-100 only at street vendors and major kiosks chains. They are rarely offered at airports or tourist hotspots etc. On the street you will be told that you don't need registration. As it's required by law, you'll risk disconnection, but you might be fine for a short time. In a kiosk chain store let them register it for you.

Top-ups are available at the usual stores like FamilyMart and 7-Eleven. Check balance by *502#, check your number by *504#.

SIM plans
They offer different plans that can't be changed. As it's only written in Thai on the package, it might be hard to find out as they differ:
 * SIM Me and You is sold in some 7-Eleven and Jaymart stores. You can add Non-Stop packages capped at 1 Mbps: 500 MB for 3 days: THB 49 - *555*33#, 800 MB for 5 days: THB 79 - *555*34#, 1 GB for 7 days: THB 99 - *555*35#, 2.5 GB for 30 days: THB 289 - *555*32#. For overuse data will be throttled further to 64-128 kbps.
 * SIM Rider is sold in some 7-Eleven and Jiffy stores. It has unlimited data capped at 1 or 4 Mbps.
 * @ max. 1 Mbps: THB 20 for 24 hours - *555*81#; THB 55 for 3 days - *555*55*1#; THB 99 for 7 days - *555*53*1#
 * @ max. 4 Mbps: THB 24 for 24 hours - *555*84#; THB 63 for 3 days - *555*85*1#; THB 119 for 7 days - *555*86*1#

More infomation

 * IDD prefix for cheap foreign calls: 009 starting at THB 1.50 to some European, Asian countries and the US
 * APN: internet
 * Website in Thai only: http://www.penguinsim.com/

Line Mobile (on dtac)
LINE is the most popular social messenger in Thailand. In 2017 they have teamed up with dtac and launched LINE Mobile powered by DTN on dtac's 3G and 4G network as a MVNO. LINE Mobile offers unlimited use of free Line services including Line Messenger, Line Calls, Line Video, and Line TV not debited from your data allowance.

Availability
This SIM card is only available online through their website delivered by courier all over Thailand selecting one of their plans from below. For activation foreigners need to send a selfie with the SIM card and another pic with the photo of your passport. So it might not be so useful for travellers as it might take a while (they say 2-3 days) and you need a postal address in Thailand.

All management of the SIM card is made through their app available for iOS and Android. For payment it need to be linked to a VISA, MasterCard or a Rabbit LINE Pay.

Data feature packages
All LINE applications are free and basic data at low speed of max. 256 Kbps are for free as well as SMS. Fast data up to 100 Mbps are taken from one of these monthly combo plans which can be changed each month: For the packages marked with (#) a 50% discount (1/2 of the displayed price) is given every month for max. 12 months. For extra data you can add 1 GB at 60 THB.

More info

 * APN: internet
 * Website in English: http://th.linemobile.com/en

Open by i-mobile (on CAT)
I-mobile by the Samart Group was a MVNO on the CAT network.

The Bangkok Post claims that the TOT-based service had fewer than 10,000 subscribers, while the CAT-enabled MVNO accounted for less than 5,000 users. The company has informed the National Broadcasting & Telecommunications Commission (NBTC ) of its plans to suspend all marketing activities and close down. The company was closed in summer 2017 and all activitites on this SIM will be terminated by the end of 2017.