Updated 1 October 2026 · LocalKey consultant team
For a trip that crosses Hong Kong SAR, Macau SAR and mainland China, use a multi-region Greater China travel eSIM (for example a CMHK-style product) or a Hong Kong tourist SIM with mainland roam add-ons — and activate a CMHK-style multi-region eSIM in Hong Kong or Macau before you enter the mainland. A separate mainland tourist SIM is still the path if you need a domestic +86 number; details for that landing flow live in our eSIM and SIM in China for foreigners guide.
Which eSIM or SIM covers Hong Kong, Macau and mainland China together?
Multi-destination travel eSIMs and some Hong Kong-issued tourist prepaid products cover data across Hong Kong, Macau and mainland China under one plan or with an official roam add-on. China Mobile Hong Kong (CMHK) and CSL both publish visitor products aimed at this three-jurisdiction route; global marketplace eSIMs labelled for China + Hong Kong + Macau are another common path.
The CMHK Chinese Mainland, Hong Kong and Macau Travel Data Card (eSIM) routes data on China Mobile (CMCC) on the mainland, CTM in Macau and CMHK in Hong Kong. The CMHK prepaid eSIM user guide states you can activate after download in Hong Kong or Macau, and that the service cannot be activated in Chinese Mainland — activate before you visit the mainland. If the product includes Hong Kong service, complete real-name registration via the SMS link; without Hong Kong real-name registration, only mainland and Macau data remain available.
The CSL 5G Discover Hong Kong Tourist SIM, listed by the Hong Kong Tourism Board Get Online guide and detailed on the CSL tourist prepaid SIM page, includes shared Hong Kong and Macau data, with optional data passes that extend coverage to Mainland China, Hong Kong and Macao. HKTB notes an eSIM version and retail at csl and 1010 shops, 7-Eleven and Circle K stores, and the Hong Kong Tourism Board Kowloon Visitor Centre at the Star Ferry Concourse in Tsim Sha Tsui. Complete real-name registration before Hong Kong activation. Current package entitlements change — confirm details on the carrier page on the day you buy; this guide does not list prices.
| Option | Best for | Networks (examples) | Real-name step | Local number |
|---|---|---|---|---|
| Greater China travel eSIM (e.g. CMHK) | Continuous data across all three jurisdictions | CMHK (Hong Kong), CTM (Macau), CMCC (mainland) | OFCA real-name if Hong Kong service included | Usually data-only; no mainland +86 |
| Hong Kong tourist SIM (e.g. CSL Discover) | Hong Kong base with Macau days and short mainland hops | CSL Hong Kong + Macau shared data; mainland via official roam add-on | OFCA real-name before Hong Kong activation | Hong Kong number; not a mainland +86 |
| Mainland tourist SIM (Unicom / Telecom / Mobile) | Longer mainland stay or apps that need +86 SMS | Mainland domestic networks | In-person passport registration at official counter or self-operated hall | Mainland +86 number |
For city nights in Hong Kong and Macau before or after mainland legs, a multi-region eSIM or Hong Kong tourist SIM with a mainland add-on usually covers maps and messaging without a new physical card at every crossing.
Do visitors need real-name registration for prepaid SIMs in Hong Kong or on the mainland?
Yes. Hong Kong prepaid SIMs need OFCA real-name registration before activation, and mainland SIMs need MIIT real-name registration with your passport in person at an official operator channel.
Under OFCA's Real-name Registration Programme, all prepaid (PPS) and new SIM service plans used for person-to-person communications in Hong Kong require real-name registration before activation. Visitors without a Hong Kong Identity Card use a valid travel document or passport. OFCA states that an HKSAR passport and a British National (Overseas) passport are not accepted as proof of identity for this registration. Registration is free and is handled through the carrier's portal or app; carriers send an SMS when registration succeeds.
On the mainland, MIIT rules list a foreign citizen passport as a valid identity document for telephone user registration. A regional MIIT-channel guide for foreign nationals (published 14 April 2026) states that foreign nationals apply in person at self-operated China Telecom, China Mobile or China Unicom business halls with a passport or Foreign Permanent Resident ID — another person cannot apply on your behalf with your documents. Airport official counters for tourist SIMs follow the same passport real-name step; see the mainland-focused eSIM and SIM in China for foreigners page for landing desks and phone checks.
Data-only international travel eSIMs that never issue a Hong Kong or mainland number may not need OFCA or MIIT SIM registration for the travel profile itself. Any Hong Kong-issued prepaid product that provides Hong Kong service still needs OFCA compliance before that Hong Kong portion activates.
What changes for Google and other apps when you enter mainland China from Hong Kong or Macau?
On mainland networks and many mainland Wi-Fi networks, some foreign apps and sites — including common Google services — are unavailable, while Hong Kong SAR and Macau SAR networks do not apply the same mainland filtering. Plan maps and payments on tools that already work in China before you rely on anything else.
Crossing from Hong Kong SAR or Macau SAR into mainland China changes which network your phone uses:
- Mainland domestic SIM or mainland hotel/cafe Wi-Fi: traffic follows mainland network rules. Plan navigation on a China-capable map (Apple Maps on iPhone, or a local map app) and payments on Alipay / WeChat Pay.
- Travel eSIM or Hong Kong SIM while roaming on the mainland: behaviour depends on the product and how the carrier routes data. Do not assume every Hong Kong SIM keeps every foreign app reachable on mainland partner networks — confirm with the carrier's roam notes, and keep mainland payments and maps ready either way.
Hong Kong day-to-day payments often use Octopus plus cards and cash; AlipayHK and WeChat Pay HK are separate Hong Kong wallets — see Octopus, AlipayHK and WeChat Pay HK for visitors and HKD, MOP and RMB money. For connectivity setup detail on the mainland landing path, use eSIM and SIM in China for foreigners.
How should you set up a travel eSIM before you leave home?
Install the travel eSIM on home Wi-Fi before you fly, keep your home line for SMS, and assign mobile data to the travel line — then activate any Hong Kong-based multi-region product in Hong Kong SAR or Macau SAR before you enter mainland China.
- Confirm the phone is carrier-unlocked and eSIM-capable.
- Buy the plan and install the profile over Wi-Fi (QR code or carrier app). Label it clearly (for example, "Greater China travel").
- Keep the home line for voice and SMS (banking codes). Turn data roaming off on the home line. Set mobile data to the travel eSIM.
- If the product is a CMHK-style Greater China travel eSIM, activate in Hong Kong or Macau after download — not after you have already entered the mainland.
- If Hong Kong service is included, finish OFCA real-name registration from the carrier SMS or portal before you need Hong Kong data.
- Before you leave the hotel Wi-Fi, load a map tile, open Alipay or WeChat Pay if you will use them, and confirm the travel line shows signal with data roaming enabled for that line.
On a private China tour, working data keeps you linked to 7×24 support across transfers. On an Independent trip — your own China itinerary, planned, booked and backed, with a local guide as an optional add-on on demand — landing data covers the first maps and chats. On a Private Guided trip, private guides and driver stay reachable the same way.
When is a separate mainland SIM better than one multi-region plan?
Choose a mainland tourist SIM when you need a domestic +86 number for SMS verification, longer inland stays, or the airport / self-operated hall path described in our mainland connectivity guide. Multi-region eSIMs handle cross-boundary data well but usually do not give you a mainland phone number.
Prefer a mainland SIM when:
- Local app sign-ups need a +86 SMS code.
- Most of the trip is inland mainland China rather than short hops from Hong Kong or Macau.
- You want the official airport counter or self-operated carrier hall registration flow with passport in hand (see the mainland connectivity guide for gateway desks).
A common hybrid is a multi-region travel eSIM for Hong Kong–Macau–Guangdong data, plus a mainland number when +86 SMS matters (second physical tray on dual-SIM phones, or a second eSIM profile if the phone and carrier allow it). Full mainland counter steps stay on eSIM and SIM in China for foreigners.
LocalKey arranges Hong Kong SAR and Macau SAR nights and mainland segments directly — hotels, transfers and guides on one itinerary — so connectivity planning sits next to the rest of the trip.
Choose Independent or Private Guided, work with a 1:1 specialist, and reach the team 7×24 on WeChat or WhatsApp when a border, SIM or payment step needs a human answer.
