Hong Kong

Basics
The mobile networks in Hong Kong are independent from those in mainland China. Unlike there, in Hong Kong only GSM-operators are on the air. Their number has gone down to 4 in 2014 when CSL merged under the roof of Hong Kong Telecom:
 * csl. (formerly CSL and PCCW Mobile, by Hong Kong Telecom)
 * China Mobile Hong Kong
 * Three (3, by Hutchison Whampoa)
 * SmarTone

There are some MVNOs like China Unicom from the mainland or Lycamobile from UK as MVNOs in the market, reselling the networks. 2G is on 900 and 1800 MHz up to EDGE, 3G on 900 (850 on SmarTone) and 2100 MHz up to DC-HSPA+. 4G/LTE started in 2012 and covers the city on 900, 1800 and 2600 MHz on all providers while China Mobile and Three offer 2300 MHz TDD-LTE too. Coverage is excellent all over the city on all networks. Except for patchy areas in the Sai Kung & Clear Water Bay Area.

SIM cards in Hong Kong don’t need registration and are sold in many stores. It’s recommended to go to stores of the operators or a small independent phone shops where somebody speaks English. So he/she can help you with setting up. Reload vouchers can be found all over the city in places like 7-Eleven or Circle K convenience stores.

Tethering and VoIP calls are allowed for most of the cards. Generally, most of the cards in Hong Kong charge an “administration fee” from HK$ 2.00 to HKD$ 3.00 (depends on mobile operators and prepaid tariffs) which is basically a state tax. It will be deducted after 30 days of use (except SmarTone and China Mobile. These two operators charge the fee at the time you activate the SIM.)

There are some prepaid SIM cards that can be used across Hong Kong and mainland China (commonly called as "one-card-two-numbers" in local) and the "Great Firewall of China” censorship doesn’t apply to data routed through these SIM cards, so they are great options as roaming cards in China too (see China Unicom section in article of China).

csl. (formerly PCCW-HKT, one2free)
Hong Kong Telecom merged the two smaller networks PCCW-HKT and one2free to the new provider called csl after Telstra from Australia sold its shares in 2014. It has become the market leader in Hong Kong now on its combined network.

Top-ups can be made online HK$ 50-300 or using vouchers sold in csl shops, 7-Eleven, 1010, Van Go or Circle K kiosks. To top-up by voucher dial 179179, choose 1 and enter the voucher code. To check balance, type *109#.

lAn online prepaid management webpage "My Account" allows users to recharge (by credit cards, recharge vouchers), check allowances and balance, select data passes and value added services.

A monthly administration fee from HK$ 2.50 to HK$ 3.00 (depends on card type) will be charged after 30 days. In 2015 a general FUP limit of 6 GB per month on a SIM card was introduced, after which speed will be throttled to 128 kbps.

This page will mainly focus on the new csl branded SIM cards. For those discontinued SIM cards, including old one2free, PCCW-HKT, New World Mobility (NWM) and old CSL branded SIM card, you may see those details on their website. Although those SIM cards are no longer produced, they are still available in the market and still work as usual.

csl. Local Prepaid SIM card and csl. All-in-one Prepaid SIM card
Local Prepaid SIM sold for HK$ 48 or 78 with the same face value while All-in-one Prepaid sold for HK$ 100 or 180 also with the same face value. Both types of SIM card are available in all three sizes at 1O1O, csl, HKT stores, 7-Eleven, Vango, Circle K kiosks and other authorized dealers. It's valid for 180 days from activation or the last top-up. A monthly administration fee from HK$ 3.00 will be charged after 30 days for both types of SIM. The only difference between these two SIM is Local Prepaid SIM offers lower Hong Kong voice call rates (HK$ 0.06/min from 21:00 to 11:59; HK$ 0.12/min from 12:00 to 20:59), while All-in-one Prepaid SIM offers lower IDD rates to 30 countries including Canada, China, most European Countries and U.S.A. (HK$ 0.25/min to landlines. Local call rate is HK$ 0.10/min anytime). See csl webpage for more details. Local Prepaid SIM. All-in-one Prepaid SIM

For data, you need to add one of these passes (available for both types of prepaid): Multiple passes can be purchased at the same time but the validity and use of passes could be complicated. See their webpage Clause 6 under the tariff table for csl detail explanations. Local Prepaid SIM. All-in-one Prepaid SIM

The unfriendly and unhelpful staff at one of the Wan Chai branches were totally clueless about these details and all they tried to force down my throat was a $220pm package. Useless!

To all packages unlimited csl WiFi is added (for Local Mobile Prepaid SIM only, All-in-one Prepaid SIM has WiFi included already one you activate your SIM card). To get password, dial *111#. The monthly pass is auto-renewing. To stop, type *122#835*1#.

Local Octopus Prepaid SIM card
This SIM is sold exclusively at 7-Eleven stores in HK for HK$ 98 with HK$ 58 credit valid for 180 days, 300 MB of data for every 30 days (until 180 days after activation) and unlimited free WiFi access. The card can also be used as the Octopus Card with NFC-compatible phones (need to top-up the Octopus purse before use). This card is only available in Double-cut SIM card (for Standard and Micro SIM devices). A monthly administration fee from HK$ 2.50 will be charged after 30 days. These data passes can be added:

All packages come with unlimited free WiFi. * = plus 1000 local mins.

Discover Hong Kong Tourist SIM Card
This tourist SIM is released by the local Tourism Board and used to be on the PCCW-HKT network which has been merged to CSL now.

You can get the Discover Hong Kong Tourist SIM Card at any 1O1O Centres in town, including the new outlet at 5/F of the HKG Arrival Hall, more than 2,000 7-Eleven, Circle K or VanGO convenience stores, csl or HKT shops, the Hong Kong Tourism Board’s Kowloon Visitor Centre at the Star Ferry Concourse in Tsim Sha Tsui, GaryLine Travel, Nobeltime AV & Telecom and all Apple Stores in the city. It comes in all three sizes and speeds up to 4G/LTE: For more data you can add 1.5 GB plus free WiFI for 5 days at HK$ 48 and roaming data in China and Macau a HK$ 40 pass for max. 40 MB per day by *131#. Note that once your initial pack expired, there is no pay per use for local call or sending text to a local number. You must purchase the HK$ 48 add-on instead.
 * HK$ 88: 1.5 GB, unlimited local calls and WiFi for 5 days plus HK$ 30 credit
 * HK$ 118: 5 GB, unlimited local calls and WiFi for 8 days plus HK$ 48 credit

Although your initial pack or add-on valid for 5 or 8 days, your account remain for 180 days from activation or last recharge. Other than other prepaid cards, these types of SIM card do not have a monthly "administrative" fee.

China- HK - Macau - Travel SIM card
Their new roaming SIM is sold only at 1O1O Centre of Arrivals Meeters & Greeters Hall, Level 5, Hong Kong Internatl. Airport for HK$ 218 in all three sizes. It includes an 8-days pass with unlimited HK calls, 5 GB HK data, unlimted csl WiFi in HK and 100 MB roaming data in China and Macau.

For more data in HK you can add a 5-days pass of 1.5 GB, unlimited HK calls and WiFi for HK$ 48 or a roaming pass of 40 MB per day for HK$40 by typing *131#. Like Discover Hong Kong Tourist SIM card, once your initial pack expired, there is no pay per use for local call or sending text to a local number. You must purchase the HK$ 48 add-on instead.

Your account remain for 180 days from activation or last recharge even your initial package expired. This type of SIM card does not have a monthly "administrative" fee.

Check Balance and Account Management
For csl branded prepaid SIM (except Discover Hong Kong Tourist SIM), old one2free and old CSL branded SIM cards,

Press *109# SEND to check your mobile number, account balance, expiry date and subscribed packs.

Press *101# SEND for data and allowance enquiry.

All text messages are displayed in dual language (Cantonese and English) as default.

For old PCCW-HKT prepaid SIM and Discover Hong Kong Tourist SIM cards, use the following codes as they share different prepaid billing system with cal even some of their products rebranded under csl.

Press ##122# for account balance show in English, ##121# to show in Cantonese. Although we have tested both codes receive dual languages text messages.

All prepaid cards, no matter new csl, old one2free or old PCCW-HKT branded prepaid SIM, csl allows you to logon to their prepaid online services " My Account " These services provide allowances and balance enquiry, select data passes and value added services, set preferences (roaming, language, promotional messages, reset passcode or change passcode) and recharge (by credit cards, recharge vouchers).

Use your WiFi logon passcode to log on to your account. Otherwise, press *111# SEND to get your PIN or click here. For PCCW branded SIM or Discover Hong Kong Tourist Prepaid SIM, your passcode is already printed on the back of your credit card sized SIM holder, next to your phone number.

Recharge
Common recharge methods for tourists are Recharge Vouchers, Payment Kiosk in csl shops and online by credit cards. Validity will be extended for 180 days from the recharge date for all cards mentioned under this heading. csl provided additional bonus up to 33% on top of your recharge amount for selected types of prepaid cards. Check your prepaid card details on their website.
 * 1) Recharge Vouchers: Available at HK$ 50, 100, 200, 300, 1000. Available at all 1O1O, csl, HKT Stores, Circle K, Vango convenience stores and authorised dealers. Follow instructions on prepaid vouchers, call 179179 (press 1 for English, select 1 for Recharge. Then, follow voice instructions.) or use vouchers online by log on to your account or click here. Check whether vouchers are the new one as only the new csl vouchers can be used on new csl, old one2free, old PCCW-HKT, old NWM (not mentioned in this article) and old CSL branded prepaid SIM. Old PCCW Recharge Voucher can only be used on PCCW branded prepaid SIM and Discover Hong Kong Tourist Prepaid SIM cards.
 * 2) Payment Kiosk at all csl shops: Available at HK$ 50, 100, 200, 300. Located in all csl shops [Shops]. Payable by credit cards or Octopus Card, the commonly used electronic stored value card in the city.
 * 3) Online: From HK$ 50-300. Pay by any credit cards or Alipay from China. Click here for recharge by Credit Card or log on to your account for easier steps.

More info

 * APN: mobile (for old PCCW SIM cards or Discovery Hong Kong Tourist SIM: pccw)
 * Tethering: lte.internet (for old PCCW SIM cards or Discovery Hong Kong Tourist SIM: pccw)
 * Website: http://www.hkcsl.com/en/Prepaid/
 * Customer Services: (+852) 179179, press 1 for English, then 3, 2, 0 to speak to a representative.

China Mobile Hong Kong
China Mobile from mainland China is the biggest network provider of the world what customers are concerned. It operates a network in Hong Kong too. Unlike in mainland China its 3G and 4G is fully compatible with GSM-devices from all over the world and data is not censored on Hong Kong SIM cards. Their 2G SIM cards have been discontinued but still available and work as usual in the market. Check the package wether there are '4G/3G' wording for 4G/3G Prepaid SIM.

4G/3G Data and Voice Prepaid SIM card
This is their first prepaid SIM on 3G and 4G. It is sold for 80 HK$ with a credit of 78 HK$ valid for 180 days. Default data rate is 0.5 HK$ with a daily cap (at midnight) at HK$ 28 with a FUP of 1 GB per day, throttled to 128 kbps beyond. A monthly administration fee of HK$ 2.00 will be charged once you activate your SIM and recurred every 30 days.

You can add these data packs for more high-speed data, all packs support 4G network but data speed depends on your subscribed package:

* Tethering and P2P access are not allowed on their "3G Lite Unlimited Data Package". Use only on handsets with a screen smaller than 7".

4G/3G Individual Traveler SIM
If a 1.5 GB 5-day package is all you need, this is the cheaper way to go. The SIM is for HK$ 68 with the package activated, ready to use, and HK$18 credit available for any voice or texting needs. Your account is valid for 30 days from activation or 90 days from activation if you buy and activate your SIM card at CMHK Shop or online shop on or after 31 Mar 2016. For more data you can add one of the packages mentioned above. The same default rate applies as well. A monthly recurring administration fee of HK$ 2.00 will be charged once you activate your SIM.

Roaming SIM cards from China Mobile HK
China Mobile sells many different roaming SIM cards with a data allowance for HK and mainland China on its network there. They are a good way to bypass the "Great Firewall of China". But for China Mobile you need to have devices for their 3G and 4G frequencies, which are rarely sold outside of China (see China section). If you are purchasing a device locally to use in China for this purpose (Android phones purchased in the mainland will not have Google services available), devices capable of using the mainland 4G network are referred to as "Dual LTE" in English. For more information check the appropriate section at China Mobile in our China article where the roaming SIM cards are featured in detail.

SIM Card Activation and Set Up
No matter which SIM you have, put your SIM in your phone and make the first call (or call the free prepaid self-help hotline 193193), follow the voice instructions to set up language. You will hear your prepaid phone number, balance, expiry date and also receive a text message with all the information just mentioned.

For 4G/3G prepaid SIM or data roaming sim (not mentioned in this section), you can also put your SIM into a smartphone, connect to network and activation completed once you received a welcome text message. Cantonese will be default language in most cases.

In case you need to change language, call free self-help hotline 193193. Press 8 for language setting, then 2 for English or 1 for Cantonese.

SIM Card Balance Enquiry and Management
To check balance and allowance (for 4G/3G Prepaid Cards), press *#130# then SEND. You will receive a prompt and follow by a text message with the summary details shown as the set up language you have chosen. Follow steps mentioned in previous section to change language.

Alternatively, download the CMHK App "1CM" or visit their website to check your prepaid balance, subscribe or manage value-added services (such as data packs), and recharge by credit cards or vouchers. A simple registration is needed beforehand. You need to enter verification code sent to you, then provide and verify your email address, and set up your account passcode.

Recharge
CMHK provides range of recharge methods. Recharge HK$ 50 or more will extend your card validity for 180 days from the recharge date. Recharge less than HK$ 50 will only extend 30 days or validity unchange if your original expiry date is longer.

CMHK provides 5%-30% bonus on top of your recharge amount. In addition, an additional 5% bonus will be provided if you recharge through Octopus Self-service Payment, Credit Card Auto-Fill, Online Refill and PPS with recharge amount HK$ 50 -199. Check your prepaid card details on CMHK website to see details.

The following are some common recharge methods to tourists.
 * 1) Flex-refill: From HKD $10. Available at CMHK Shops. Payable by cash (HKD) or credit cards. Credit will be available to your account in 15 minutes.
 * 2) Octopus Self-service Payment: From HK$ 10, Available at Octopus Self-service Payment Machine in CMHK Shops, Payable by Octopus Card, the commonly used electronic stored value card in the city. Credit will be available to your account  in 15 minutes.
 * 3) Recharge Vouchers: With HK$ 30, 50, 100, 200, 300. Available at CMHK Shops, Circle K, Vango Kiosks,  and authorised dealers (such as newspaper stand). Each voucher must be used before its own expiry date. Follow instructions on vouchers to recharge, use CMHK app (Click Account, then Prepaid Card Refill and choose Activate Refill Voucher) or activate online. Credit will be available to your account immediately.
 * 4) HK$ 100 Electronic Refill Voucher: Value as HK$ 100. Exclusively at any 7-Eleven convenience stores in the city. Voucher printed as a receipt liked paper. So use it as quick possible as it is easy to lost or damaged. Recharge instructions printed the vouchers.
 * 5) Online Refill: From HK$ 30-1000. Use CMHK website or CMHK app. Payable by credit cards.

More info

 * APN: CMHK
 * Tethering: CMHK
 * Website: http://www.hk.chinamobile.com/en
 * Customer Services: (+852) 2945 8888, press 2 for English, then your prepaid number, press 6 in next menu to speak to a representative. Local call rates apply.

Three (3, by Hutchison Whampoa Ltd.)
Three offers 4G/LTE, 3G, GSM dual-band mobile telecommunications and Wi-Fi services in Hong Kong. The MTR (metro, subway) is fully covered by LTE now.

They have a huge portfolio of different SIM cards on 3G only and on 4G too which are presented one by one. Their “face value” is at the same time purchase price and preloaded credit. An “administration fee” of HK$ 2.50 per month will be imposed on all cards from summer 2015.

To recharge buy vouchers and press ##105*<16-digit PIN># and

Three sends out SMS notifications about balance, expiration and status of packages, so be sure to set the system language to English, once you have inserted the SIM: Press ##107*2# and

HK Local Prepaid SIM (2G, 3G)
Their standard voice and data SIM sells for HK$ 48 or HK$ 98. Data is HK$ 2 per MB and beyond unlimited with a daily cap of HK$ 28 (until midnight) and a monthly cap of HK$ 338. A daily and monthly FUP of 5 GB applies. You can add 1 GB for HK$ 48, 2 GB for HK$ 78 and 5 GB for HK$ 188, all vaild for 30 days.

Activation of my card failed and it took over an hour and three phone calls to completely clueless staff to get it sorted. The default language is in Chinese and it is a huge hassle to change as you have to jump through all the phone-in hurdles and unwanted and highly irritating advertizing to reach someone who can change it to English for you. There is no magic code! The accompanying "instruction" booklet is rubbish and does not give the information you need. You will likely have to call them to get this mess sorted out!

HK Visitor Prepaid SIM (2G, 3G)
This voice and data SIM has a face value of HK$ 128 and the same data rates as the local prepaid SIM, but no add-on packages. Instead, you can buy for HK$ 88 a “3-day-pass” package to have unlimited local calls and data for 3 days. To activate press *127*388#, to deactivate #127*388#

4G/LTE Data Package SIM
Their voice and data SIM with monthly packages. They are sold in three sizes: LTE Data Package is valid for 30 days from the day of package subscription. The package will be terminated after package end date (cut-off time is 23:59). Manual re-subscription is required after package expired.
 * 1 GB: HK$ 168
 * 2 GB: HK$ 248
 * 3 GB: HK$ 298

To add data, the rates are equal to the start-up prices. Text code *127*610# for 1 GB, *127*620# for 2 GB and *127*630# for 3 GB. To get free 3 WiFi send a blank SMS to 503106 (for 0.5 HK$).

4G/LTE day pass data SIM
This is the same product with voice, text and data on a time-based package. They are sold in three sizes: LTE Local Data Package is valid for 2-day/7-day/14-day from the day of package subscription. The package will be terminated after package end date (cut-off time is 23:59). Manual re-subscription is required after package expired.
 * 2 days: HK$ 38 – FUP: 2.5 GB
 * 7 days: HK$ 88 – FUP: 3.5 GB
 * 14 days: HK$ 168 – FUP: 5 GB

To re-subscribe type *127*602# for two days, *127*607# for 7 days or *127*602# for 14 days. Same prices as above.

When you have reached the related usage level, the Fair Usage Policy will be applied. The customer can still continue to use the service. However, you may have lower network priority to 128 kbps.

4G/LTE Data Prepaid SIM
This SIM has voice and text too and is sold for a face value of HK$ 198. Default data is HK$ 2 per MB capped at 33 HK$ per day. For this SIM, they offer three different data packages: The 10-day pack expires, the monthly packs auto-renew if there is credit. To stop type #127*650# for the 300 MB and #127*617# for the 1.5 GB pack.

3G Data Prepaid SIM
This SIM is like the 4G Data Prepaid SIM but only on 2G and 3G. It is sold for a face value of HK$ 198. Default data is HK$ 2 per MB with a daily cap of HK$ 18 and a monthly cap of HK$ 168 for 5 GB. You can add a weekly pack for HK$ 68 with FUP 2 GB. Activation *127*763#, as it will auto-renew, to deactivate #127*763#. Or monthly 1 GB at HK$ 48 (*127*748#) or 2 GB at HK 78 (*127*782#).

Wireless Broadband Mobile SIM (2G, 3G)
This SIM is sold in different sizes: for a face value of HK$ 48, 68, 98 or 298. It has voice and text too. Default data is HK$ 2 capped at HK$ 28 per day and HK$ 348 per month with a FUP of 5 GB.

For extra data they offer the same weekly and two monthly packs as for the 3G Data Prepaid SIM. Additionally, a monthly 5 GB pack is sold at HK$ 188 (*127*719#).

Roaming Data SIM (for China and Macau)
For travelers to mainland China, Three gives out this roaming SIM sold for for HK$ 78. For HK$ 68 you can book a 3-days pass (0-24 hrs local time) with 150 MB valid on China Unicom network in China and Three network in Macau. To subscribe type *127*31#, to unsubscribe #127*31#.

Three Wi-Fi Service in Hong Kong
Three provides Wi-Fi service at over [https://www.three.com.hk/website/appmanager/three/home? 17,000 hotspots] in Hong Kong. This service is using the auto-login function of smartphones. Once you are subscribed to the Wi-Fi Service, your phone will automatically login as soon as you near a Three Wi-Fi hotspot.

All SIM cards with the word "Data" in their name (i.e. "4G LTE Data Prepaid SIM Card"), have the Wi-Fi service included for free. This service needs to be activated. To activate dial ＊127＊8#.

For all other SIM cards the Wi-Fi service is $18 per month (30-Day). To activate send blank SMS to 503106. To deactivate login to your account at [http:// http://www.three.com.hk/3Care/ http://www.three.com.hk/3Care/]

More info

 * APN: mobile.three.com.hk (for 3G SIM cards) / mobile.lte.three.com.hk (for 4G SIM cards)
 * Tethering: share.three.com.hk
 * Website: http://www.three.com.hk
 * Customer Services: (+852) 1033

SmarTone
Though SmarTone is the smallest operator in the city by market share. Yet it constantly gets good marks for its 3G and 4G service.

Availability
Unlike the other operators, they only have one prepaid product they offer 3 types of prepaid products now, 2 mainly for local use and 1 for roaming.

Broadband & Voice Stored-Value SIM

This type of SIM card used to be the only prepaid product offered. It is sold at their own SmarTone stores store locator and authorized dealers: reseller's list in Standard/Micro or Nano SIM. Start-up price is HK$ 48, HK$ 80 with the same face value in all three sizes. (It has been proved SmarTone Shops replaced the HK$ 48 version to HK$ 48 Broadband & Voice Stored-Value SIM Extra. See below.) There is a special version of HK$ 168 face value being sold exclusively at Apple Store in city but not mentioned on the website. All 3 face value share the same tariffs. A monthly recurring administration fee of HK$ 2.50 will be charged once you activate your SIM.

Data Rates (4G included): To subscribe the monthly package, press *111*191# then SEND. To unsubscribe, press #111*191# then SEND.
 * 1 hour: HK$ 8.00 - default rate, FUP applies. Capped at HK$ 24 until 23:59 on the same calendar day
 * 1 month:
 * 300 MB: HK$ 38.00, overuse charged at HK$ 10/ 50MB.

Note that data charged at default rate automatically. Switch off mobile data on your devices if you do not need to use. For HK$ 38.00 monthly package cannot use conjunction with the default HK$ 8.00 hourly rate.

Under FUP (Fair Usage Policy), when the data usage is calculated within a month from the first day of the bill cycle reaches fair usage level of 5 GB, data service continues without speed throttling or data capping, but access to network resources will be given lower priority and data service experience may be affected.

Broadband & Voice Stored-Value SIM Extra

This type of prepaid card introduced in 2016 and replaced some face value version of the previous prepaid product. It is sold at their own SmarTone stores  store locator  and authorized dealers:  reseller's list  in three sizes. Start-up price is HK$ 48 with the same face value. A monthly recurring administration fee of HK$ 2.50 will be charged once you activate your SIM. The only difference between these two product is data rates which have been raised but more options provided.

Data Rates (4G included): Activate data package online here. Monthly packages auto-renew. To stop, type #111*128#.
 * 1 hour: HK$ 10 - default rate too, FUP applies
 * 1 day (until midnight): HK$ 30, FUP applies
 * 1 month:
 * 250 MB: HK$ 45
 * 1 GB: HK$ 168

Under FUP (Fair Usage Policy), when the data usage is calculated within a month from the first day of the bill cycle reaches fair usage level of 5 GB, data service continues without speed throttling or data capping, but access to network resources will be given lower priority and data service experience may be affected.

Tethering is not allowed according to SmarTone but not blocked. Tethering may be possible (proved). Facetime, VoIP and WhatsApp Calls are possible.

Activation

No matter which types of SIM you have, once you insert the SIM into your phone, the card is automatically activated and you will be receiving a 6-digit "SIM card PIN". Be sure to save this PIN. This PIN is needed later for different actions like recharging online (see below) or when calling customer services.

Recharge, Balance Check, Validity
You can recharge by buying recharge vouchers at any  SmarTone Stores or authorised deals with SmarTone signage (eg. selected Newspaper Stand).

If you are in Hong Kong and on the SmarTone network, you can easily recharge online by visiting their  Top-up site.

If you are abroad or want to top-up on a desktop or other devices, visit their Online Recharge Services and pay by a credit card. You need your phone number and the 6-digit "SIM card PIN" you've got once you activated your card.

To check balance, dial *111#. You will receive a SMS with the information about expiry date, store value and data charge consumed.

Your SIM card is valid for 180 days from the activation date. Once you recharge w/ HK$50 or more, your validity is reset for another 180 days.

Travel Data Card
For cheap roaming in other Asian countries, they sell a special SIM card in all three sizes called Travel Data Card. The SIM card will be automatically activated once data has been used upon roaming. Data service can be used from the activation date to 23:59h (in Hong Kong time) on the last day. The card supports roaming data only (including tethering). Voice, SMS and other services are not available. The card is for one-off use only. Top-up is not applicable.
 * for China (China Unicom) and Macau (SmarTone), 300 MB for 3 days: HK $98
 * for Japan (Softbank), Taiwan (Chungwha), Singapore (M1), Malaysia (Celcom) and Indonesia (XL Axiata), unlimited data for 7 days: HK$ 228
 * for Korea (SK Telecom) and Thailand (dtac), unlimited data for 5 days: HK$ 238

More info

 * APN: smartone
 * Tethering: internet
 * Website: http://www.smartone.com
 * Customer Services: (+852) 2880 2688

China Unicom
The second largest mobile provider in mainland China acts as a MVNO in Hong Kong. It operates on the network of Three (some newer voice SIMs use the CSL network instead). China Unicom doesn’t offer good prices for the city, but hassle-free roaming cards for their network in mainland China. They come without registration and data will not be censored. Their offers are described in detail in the China section.

For people going to both HK and Macau, they also have the Voyage King prepaid SIM. It is sold for HK$68 and comes with unlimited voice calls in HK, unlimited data in HK and Macau (throttled to not less than 128kbps after exceeding 1GB), and HK$ 30 of voice credit for international calls, SMS, as well as any voice calls in Macau for 7 days. It can not be reloaded after initial activation; once 7 days are up you must buy another.

Lycamobile
Lycamobile from Britain soft-launched in April 2015 as one of the MVNOs in the city. It uses the network of Three by Hutchison Whampoa in 2G, 3G and 4G/LTE and gives free calls amongst Lycamobile users.

Availability
Like usual, Lycamobile SIM cards are available for free in their sales outlets. Unfortunately, there is no online list and they may be hard to find at first. Alternatively, they can be ordered online to be sent to an address in town. Top-ups can be made using a voucher bought at one of their sales partners or again online using an international credit card.

Data packages
Data by default is charged at HK$15 per MB. They sell these packages:
 * daily packages
 * 1.2 GB: HK$ 18, activation: *139*1011#
 * 5 GB: HK$ 68, activation: *139*1012#
 * weekly packages
 * 500 MB: HK$ 18, activation: *139*1071#
 * 1 GB: HK$ 28, activation: *139*1072#
 * 3 GB: HK$ 68, activation: *139*1073#
 * 5 GB: HK$ 118, activation: *139*1074#
 * monthly packages
 * 500 MB: HK$ 38, activation: *139*1031#
 * 1 GB: HK$ 48, activation: *139*1032#
 * 3 GB: HK$ 138, activation: *139*1033#

Tourist Plans
For tourists, they offer two packages:
 * HK$ 78: unlimited local calls, 1 GB data and HK$ 20 credit for internatl. calls and texts, valid for 5 days, activation: *139*1105#
 * HK$ 98: unlimited local calls, 3 GB data and HK$ 30 credit for internatl. calls and texts, valid for 7 days, activation: *139*1107#

More info

 * APN: data.lycamobile.hk
 * Username: lmnl (it says on their website, but this can be an error), try: lmhk
 * Password: plus