Thailand

Availability
SIM cards and top-ups are available widely in Thailand from the major carriers (the big three: AIS, dtac and True Move H) as well as a number of smaller 'boutique' provides that lease government bandwidth and equipment or MVNO (such as iMobile or Tune). Purchase of a new SIM card/number is easy, and can be done at operators' shops and any 7-11 as well as at many airport kiosks. Thailand has began requiring SIM card registration and the production of ID (such as passport for non-Thais) must be required.

Arriving at BKK (Suvarnabhumi) airport in Bangkok, you have the best choice. The 3 major players have their flagship stores in the arrivals hall almost side by side. So you can check prices and compare promotions. All carriers give out monthly promotions which are not mentioned in this article.

The situation at DMK (Don Mueng) airport, Bangkok's budget airport and other regional airports is different as only a True shop is on location, but several small shops sell the tourist SIMs of other carriers (AIS/dtac). In Phuket, you may find True Move SIMs given out for free.

Concerns for all providers
All of the big three operators do stock all SIM card sizes from normal, micro SIM to nano SIM. Normally the micro SIM card can be popped out from the normal SIM card but the nano SIMs are often sold separately. It is advised that you request to the staff that you want which SIM card size before you buy.

All of the operators also allow tethering. All of them treat all data going through their network equally therefore your plan would include tethering by default to be used and shared to your other devices. 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.

For voice calling overseas heavily reduced rates as low as VoIP providers are offered by the three majors using special IDD codes. Let them give you the cheapest option for your destination which has to be dialled before the country code.

Topping up
Adding credit or airtime is quite easy in Thailand. Airtime gives both validity and ability to make calls or subscribe to data packages. A few physical places where you can topup: 7-Eleven, Family Mart, BigC, Tesco, phone kiosks and the outlets of the Telecoms.

Adding credit online is also quite easy and there are a few options. MobileTopup.com accepts Visa and MasterCard as well as debit cards and works on a mobile device. If you have Bitcoin you can topup at https://www.bitrefill.com or http://bitcoins.com.th incurring conversion fees, and if you use Webmoney you can do it thru wm-thailand.comFrom outside of the country mobile you're best bet is to pay online.

Expiry policy
You have to top-up a Thai SIM card every 45 days or pay to add validity to keep it alive as well as one call or SMS activity every 6 months. Normally, Thai SIM cards expire 45 days after the last top-up unless you are able to add extra validity. So It's hard to keep them alive outside the country, but start-up prices for new starter packs are minimal. True and dtac let you add validity for a price, check this site on how to extend.

Fair Use Policy (FUP)
A FUP is a the way to market a throttled plan as "unlimited" and Thai operators do that a lot. They use FUP to give a certain data volume at their fastest speed and once you have used it up, you will be reduced to a lower speed between 384 and 64 kbps. Slow speeds are normally still good enough for email and texting, but not for browsing websites.

Network Compatibility
Over the past years there have been massive changes to all the major operators' networks. Before you purchase any SIM card, please make sure that the network you are choosing is compatible with your devices (see below). The big three providers have separate 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.
 * AIS has 3G/DC-HSPA on 900 and 2100 MHz and started in 2016 with 4G/LTE Advanced called "4.5G" on 1800 and 2100 MHz
 * dtac has the largest 3G spectrum: 3G/DC-HSPA on 850 and 2100 MHz and 4G/LTE on 1800 and 2100 MHz.
 * 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
 * CAT: is on 3G/HSPA only on 850 MHz 
 * TOT: is on 3G/HSPA on 2100 MHz and plans 4G/LTE on 1800 MHz 4G/LTE and 2300 MHz TDD-LTE.

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, also covers 77 provinces but also lacks coverage too.

Note that all old 2G/GSM networks are about to be shut down in 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.

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.

Registration
Under a new law all SIM cards have to be registered as of July 31, 2015. Be prepared to show an ID at the point of purchase from now on. This is now enforced in all of providers stores very strictly. You can check your registration status by dialing *151#.

In 2016 the military govenment announced plans to issue all foreign tourists with location-tracking SIM cards to monitor them as it has vowed to crack down on those who overstay on their visas or commit crimes. But so far many questions remain open about how and when this new policy will be actually implemented.

WiFi
Thailand has a very strong network of WiFi hotspots in 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, that can accessed through your mobile number and hotspot use is included in some of the plans or for a surcharge.

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 and in January 2016 on the 1800 and 2100 MHz band, partly marketed as "4.5G" or LTE Advanced. It covers Bangkok and 30 cities for a start: 3G/4G coverage map

AIS operates two different prepaid brands called 1-2-Call and 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 a top-up code slip or cash card is recommended. They are sold all over at convenience stores such as 7-Eleven, Family Mart, Tesco/Lotus, Big C or online. Every AIS store has a "payment kiosk" that is an automated top-up machine as well. Top-ups can also be made by credit card on the AIS service page in increments of 50 THB.

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

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

1-2-Call
1-2-Call SIM cards are their regular prepaid voice and data cards. From January 2016 all new SIM cards are on 4G/LTE, and have Ookla/Speedtest branding on the package. If you want LTE, be sure to get a new one. They are all sold for THB 50 with a THB 15 call credit:
 * Freedom SIM: is their most common prepaid card (and the only one that some AIS stores sell). It includes 15 THB call credit in 30 days and 100 MB valid for 48 hours. The current promotion includes 500 MB data and AIS Super Wifi for 7 days on activation, increasing to 1 GB data and AIS Super Wifi for 7 days for subsequent months 2-5, and goes back to 500 MB data and AIS Super Wifi for 7 days in month 6. All bonuses for subsequent months require a top up of at least THB 150 per month. This promotion is currently set to expire May 31, 2016.
 * Zeed SIM: though targeted to teens, this is actually one of their best packages. 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 markup over face value (e.g. 99 THB rather than 50 THB). Be aware that there is an older version of the SIM that may be 3G only - you should check that the packaging indicates 4G if that's important to you.
 * Facebook SIM: for social media. It includes unlimited Facebook, LINE, Kakao Talk and Whatsapp for 1 month on activation, and future months if you top up at least THB 100 per month. The current promotion also includes AIS Super Wifi and 1 GB/mo of nighttime (11p - 6a) 4G data. Change from other tariffs by calling *777.
 * Net SIM 4G: this comes with a weekly package of 2 GB and unlimited AIS Super Wifi, and further weeks are renewed automatically at 99 THB/week. This SIM is difficult to find in stores, but the same packages can be applied to the Facebook SIM.
 * Net SIM 4G (old) and Net SIM 3G: comes with 500 MB/7 days data at activation. On these SIMs you are subscribed to 500 MB/1 month with unlimited AIS Super Wifi for THB 89.
 * Other: As of May 2016 AIS has numerous other SIM cards, but most are probably not of interest to visitors (and may be difficult to find in stores). Check the AIS SIM card page for details.

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 booked on all their SIM cards from above (add 7% taxes). Some of the best packages are listed in the table below, but see AIS's table of addons, "Package Internet" and "Super Speed Package" and "Internet 4G/3G" pages for additional options that may be more efficient for your duration of stay and volume of data: Below are the available monthly (auto-renewing) packages that you can switch to (from all SIM types like Freedom, Facebook, Zeed, and Net). If you switch to these packages, you will lose the original benefits of the SIM (e.g. the Facebook SIM 1 GB night data). For all prices add 7% tax: There is a package switching fee of THB 10.

Combined Packages: Smartphone SIM
AIS sells Smartphone SIMs too, which have special combined packages for domestic calls and data. Their special starter pack is sold for THB 50 and contains 100 MB and 15 mins talk time. You can change to one of these monthly "iSmart" packs (7% taxes apply): To opt in, call *777 and choose package. All voice time is domestic to all networks. All data is "unlimited" meaning throttled to 64-256 kbps accrding to package size when data is used up.
 * iSmart 299: THB 299 - 100 mins, 500 MB
 * iSmart 399: THB 399 - 150 mins, 750 MB
 * iSmart 599: THB 599 - 300 mins, 1.5 GB
 * iSmart 799: THB 799 - 400 mins, 2 GB
 * iSmart 999: THB 999 - 500 mins, 3 GB

Traveller SIM
Alternatively, AIS offers to visitors their Traveller SIM in three starter packs: The SIMs are available at their store at Suvarnabhumi Airport (299 and 459 THB only) or other stores, 7-11 (199 THB only), Family Mart (299 THB only) and more outlets.
 * for 199 THB you get for 7 days 500 MB data (beyond throttled to 64 kbps), 7 days of unlimited calls between Travellers SIM users, 15 THB credit with 30 days validity
 * for 299 THB you get for 7 days 1.5 GB data (beyond throttled to 64 kbps), 100 THB credit with 30 days validity
 * for 459 THB you get 3 SIM cards sharing 3 GB data (beyond throttled to 64 kbps) and unlimited calls between sharing cards.

The default data rate outside packages is THB 2 per MB. These add-ons can be bought (tax incl.): 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 (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). Note that for use more than 1 day, it is cheaper to buy a Facebook SIM for 50 THB, which includes 1 month of unlimited AIS Super Wifi on activation!

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

you! Mobile
you! Mobile is a new sub-label of AIS launched in 2014. This tariff can not be changed to/from 1-2-Call up to now. Availability is at their stores (see above). 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):

Further information

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


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

dtac
dtac is Thailand's second largest network by the number of users. It is partly owned by Telenor group from Norway and is the network that owns the biggest wireless bandwidth in the country. Its prepay 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 on the additional 1800 MHz frequency which is much more common internationally in the metro Bangkok area mostly.

Where to buy
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.

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 two 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 299: 299 THB, 100 THB credit included valid for 35 days and "unlimited" internet (FUP: 1.5 GB) for 7 days
 * Happy Tourist SIM 599: 599 THB, 100 THB credit included vaild for 35 days and "unlimited" internet (FUP: 4 GB) for 15 days
 * 229 THB: 1 GB, 30 minutes valid for 7 days
 * 429 THB: 4 GB, 30 minutes valid for 30 days
 * 700 THB: 6 GB, 50 minutes valid for 30 days
 * validity extensions:
 * 50 THB for 180 days
 * 100 THB for one year

Regular 3G and 4G SIM cards
You can simply get any of their prepaid SIM cards. It almost does not matter which one you get as long as it is the prepaid Happy on Trinet SIM cards. The various 3G SIM cards cost you 49 THB and include very little value you can use (similar to AIS above). You are expected to top up almost immediately to be able to make long calls and use data. The 4G SIM card is sold for 69 THB and includes 500 MB for a week. If you top up at least 300 THB per month on the 4G SIM, 1 GB are given out for free.

For the unlimited internet plans below in 3G and 4G, 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 (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.

For monthly plans only, additional data 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.

Here are further classical volume based plans in 3G and 4G:

For all these plans:
 * free Facebook is included
 * excess and default data: 1.99 THB per MB
 * to see remaining data, dial: *101*9#
 * these data add-ons are available:
 * 5 THB: 100 MB in 24 hours, activation: *104*308*9#
 * 150 THB: 1 GB in 30 days, activation: *104*50*9#
 * Viber add-ons: 1 day: 5 THB, activation: *104*600*9#, 1 week: 19 THB, activation: *104*601*9# and 1 month: 49 THB, activation: *104*602*9#

dtac WiFi passes
For dtac WiFi,when not included in your data pack, special passes are sold: Data is unlimited on the WiFis. For the 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#

Further information

 * IDD prefixes: 004 (quallity) or 00400 (budget on some tariffs like 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 third 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% in 2016 of the population: 4G coverage map in Thai and list in English. In 2015 the much more usual 1800 MHz band is added for 4G/LTE as well as 850 and 900 MHz in 2016. As the 3rd placed network, their offerings are generally 5-10% cheaper then those of AIS, but their 2G/3G coverage is a little lower too.

TrueMove and TrueMove H are two different networks (but they are 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.

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.

Tourist SIM
TrueMove H sells special SIM cards for tourists too. The SIM card is called ' 3G Tourist Inter SIM'. This name is so far misleading as in 2016 True's supreme 4G/LTE has been opened for the tourist SIM. They come in three different starter packs:
 * Free SIM (only promotional, at Chiang Mai and Phuket airports for instance): free, 20 MB data, 10 THB call credit, all valid for 7 days
 * Starter Pack: 49 THB, 90 MB data, 20 THB call credit, all valid for 30 days
 * Value Pack: 299 THB, 1.5 GB high speed data, throttled to 128 kbps, 100 THB call credit, all valid for 7 days.

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

Default data outside packs or for overuse is 1 THB per MB. These bundles above are officially advertised to be used on the tourist SIM. Unofficially, the 3G and 4G packs mentioned below that give better rates for data, proved to be addible too. So give them a try.

3G SIM Cards
You can simply get one of their prepaid SIM cards with 3G plus WiFi and add from their big variety of data packs. Old 3G SIM cards are sold for 49 THB and include very little value you can use (similar to AIS and dtac above). You are expected to top up almost immediately to be able to make long calls and use data. They can't be used on 4G/LTE.

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, 7 days, *900*8923#
 * 79 THB: 1 GB, 7 days, *900*8924#
 * 99 THB: 1 GB, 15 days, *990*8925#
 * 150 THB: 1 GB, 30 days, *990*8903#

4G SIM Cards
Their new 4G/LTE enabled SIM cards are sold for THB 79. Speed is up to 100 Mbps on 4G/LTE. Default rate outside package is 0.25 THB per MB. These monthly 4G packages are on offer and can only be booked on 4G SIM cards. For all prices add 7% taxes: All plans auto-renew after 30 days. For more data, 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#

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#

Further 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 an 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 networks connections.

It is the 4th largest mobile network operator in Thailand. They own the 850 Mhz frequency and rent it out to True Move H, and in return get to use 20% of the spectrum for their own My by CAT operation. The towers and network are operated by True Move for their 3G 850 Mhz.

Frequencies and Coverage
My only has 3G/ HSPA+ on 850 Mhz (= band 5). There is no fall-back to 2G. As My uses the same 850 Mhz network as True Move, their tower coverage is the same. By the end of 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 only 1 million customers and a market share of 1-2% so far.

My plans to provide a 4G/LTE access for its subscribers by having them roam with the 4G/LTE 1800 MHz and 2100 MHz networks of True. But this hasn't been materialized so far. So for now, only use CAT, if you have a 3G device that supports the 850 MHz band.

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

As a promotion called MY Welcome 1 GB are given out per month for 12 months, if you top-up for 100 THB.

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 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#.

My has Thailand's first real unlimited 3G data plan, called the Net Sood Khum 215:512. For 215 Baht per month you get unlimited unthrottled 512kbps data. 512kpbs is the slowest possible speed to still be considered 3G. Activation: *906*03#.

Additionaly there is a throttled plan - to 384 kbps 8am-midnight and 512 kbps midnight-8am: THB 139 for 31 days. Activation: *906*53#. These other plans with high-speed 3G data are offered: To all packages add 7% taxes. All bundles auto-renew. To stop text code with 960 instead of 906. Overuse will be charged at the default rate.
 * for one day (= 24 hours):
 * 500 MB: THB 29 - activation: *906*37#
 * 1 GB: THB 49 - activation: *906*38#
 * for one week (= 7 days):
 * 500 MB: THB 49 - activation: *906*39#
 * 1 GB: THB 79 - activation: *906*40#
 * for one month (= 31 days):
 * 1 GB: THB 150 - activation: *906*41#
 * 2 GB: THB 250 - activation: *906*42#

More Information

 * APN: internet
 * Website partly in English: http://www.mybycat.com/en/

Tune Talk (on TOT)
Tune Talk is one of the first MVNOs in the country. It started in 2013 and targets visitors, youth and professionals. It uses the network of state-owned TOT. Tune Talk is affiliated to AirAsia and the most accessible MVNO for tourists on the TOT network.

Coverage
Tune Talk is a MVNO on the TOT network in 3G on 2100 MHz only. So for using Tune, you need to have a 3G device on this frequency. TOT network is quite good in Bangkok and major towns giving high speeds on DC-HSPA+ as it doesn't have so many users as the 3 private networks. But it's in 3G only, with no fallback to 2G/GSM and still very patchy in the countryside. TOT 3G coverage map

So it might be only a choice, if you stay in Bangkok, but for travelling throughout Thailand better choose one of the three other major networks.

Where to buy
The "TuneNet!" SIM is available for THB 99 with 500 MB data at their dealers too. If you only get a "TuneTalk" SIM, you can change to TuneNet! by typing *788# and select "Tune Net".

Top up vouchers are available for THB 50, 100, 300 and 500 to give avaliability for 30 to 90 days. They are sold at Thailand Post, Big C or as electronic top-up at 7/Eleven stores.

Data packages
Data on the TuneNet! SIM is by default outside of packages THB 0.50 per MB. You can choose between these monthly packs to add data by typing *788#: Check data balance by typing *700#. Overuse is charged at the default rate. You can buy a new package for more data anytime.
 * 1 GB: 200 THB
 * 3 GB: 400 THB

Further information

 * IDD prefixes: 007 or 008, but rates are not as low as True, dtac or AIS
 * APN: tunetalk /or/ internet
 * take care that Tune Talk has a national roaming agreement with AIS. Roaming data are not included in package and charged at 2 THB/MB. So lock device to TOT and disable roaming.
 * Website in English: http://th.tunetalk.com/