Which connection for China: Thai roaming, a Chinese SIM, a travel eSIM or rented pocket Wi-Fi
A side-by-side look at four options by setup, foreign apps, Chinese number and cost type, with a decision guide based on how you travel.
Respuesta rápida
- Most visitors who want simplicity and foreign apps choose a travel eSIM installed before the flight, and keep the Thai SIM on for SMS.
- A Chinese SIM needs real-name registration with your passport at an official store and gives a Chinese number for SMS codes, but foreign apps are usually blocked, while Thai roaming is the easiest but you should check terms with your operator.
- Pocket Wi-Fi serves several devices but must be collected, charged and carried, so choose based on group size and trip style.
Four ways to get online in China
Thai travellers heading to China have four main options: roaming on a Thai SIM (AIS, True, dtac), a Chinese SIM bought and registered in China, a travel eSIM bought in advance, or a rented pocket Wi-Fi. They differ in setup and convenience, and above all in where your data exits to the internet, which decides whether foreign apps open. See the basics in “Great Firewall of China Explained for Travellers”. No option is best for everyone; the right one depends on trip length, group size and the apps you cannot do without.
Comparison table
| Opción | Setup | Foreign apps | Chinese number | Cost type | Ideal para |
|---|---|---|---|---|---|
| Roaming tailandés | Activate a pack with your operator before flying | Usually opens, not guaranteed | No (keeps your Thai number) | Daily or per-trip pack; check with the operator | Short trips needing least effort |
| Chinese local SIM | Real-name registration with passport at an official store | Usually blocked | Yes, useful for SMS verification | SIM and plan bought in China; check the operator's price | Longer stays or tasks needing a Chinese number |
| eSIM de viaje | Install over Wi-Fi before flying; enable data roaming on arrival | Usually opens; test it | No (data only) | Plan by days or data; see current price in the shop | Visitors wanting foreign apps and flexibility |
| Pocket Wi-Fi rental | Book ahead, collect and return device, charge it | Depends on the device and data route; confirm with the lessor | No | Rental and deposit; check with the lessor | Grupos que comparten una conexión |
Roaming con su SIM tailandesa
The advantage is that nothing changes: you keep your number and can receive bank SMS. Roaming data usually exits through the home network, so foreign apps usually open. Operators such as AIS, True and dtac offer China roaming packs, with different terms, data allowances and speeds, so check the current price and conditions directly with your operator and activate a pack before flying. Beware of out-of-pack roaming charges.
Chinese SIM: real-name registration and a local number
Buying a SIM in China requires real-name registration with your passport at an official operator store or counter; avoid street stalls. The result is a Chinese number for SMS verification of local apps and services. But because your data exits inside the mainland, foreign apps such as Google, LINE and Instagram are usually blocked. For the main operators, see “China Mobile, Unicom and Telecom for Travellers”.
- Needs the physical passport and time at the store, where there may be a queue.
- Suits cases that truly need a Chinese number, such as long stays or local identity checks.
- Keep the Thai SIM active in a dual-SIM phone so bank OTPs still reach you.
Travel eSIM and pocket Wi-Fi
A travel eSIM needs a supported phone that is not carrier-locked and is installed over Wi-Fi before the flight. It has no phone number but usually opens foreign apps because data typically passes through a gateway outside China; nobody can guarantee every app on every network, so test it. See “What is an eSIM and how does it work?” and “How to install an eSIM, step by step (iPhone and Android)”. Pocket Wi-Fi serves several devices at once, but you must collect and return it, charge it and carry another item, and you should ask the lessor where the device's data exits to the internet.
Ventajas
- eSIM: no store visit or device pickup, works as soon as you land
- Pocket Wi-Fi: shares across devices and needs no phone SIM slot
Desventajas
- eSIM: no Chinese number, and the phone must support it
- Pocket Wi-Fi: must be returned and charged, and can be forgotten or lost
Three questions to ask before you choose
- Will you need foreign apps during the trip? If so, a Chinese SIM alone is a poor fit, because its data exits inside the mainland.
- Do you truly need a Chinese number? Most visitors do not, since Alipay and WeChat Pay accept foreign cards; set them up and verify your passport before the trip.
- How many devices need data at once? If several, consider pocket Wi-Fi or a phone hotspot.
Decision guide
- Solo or couple, short trip, want it easy: a travel eSIM, or roaming if your operator has a suitable pack.
- Family or group that shares: pocket Wi-Fi, or an eSIM on a phone that offers a hotspot.
- Long stay, study or work in China: a Chinese SIM for the local number, plus a backup for foreign apps.
- Need OTPs from Chinese apps: a Chinese SIM, or another route the app supports for foreign passport holders.
Preguntas frecuentes
Preguntas frecuentes
Which is best overall?+
There is no single answer: most visitors pick an eSIM or roaming, and those who need a Chinese number pick a Chinese SIM.
Does a travel eSIM have a phone number?+
Most are data only with no phone number, so the Thai SIM handles calls and SMS.
What do I need to buy a Chinese SIM?+
Your physical passport and real-name registration at an official operator store. Check current conditions with the operator.
Is Thai roaming good value?+
It depends on the pack and the number of days. Compare current prices with an eSIM before deciding.
About the author
Bob Kanokphon Thongdee
- Co-founder of eSIMonline.asia
- More than 7 years in online marketing
- Founder of Cojourney Visa and Cojourney Travel
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