China has better mobile coverage than most of Europe. What it also has is a national filtering system that blocks Google, Instagram, WhatsApp and a long list of others at the network level. Your options differ not in speed but in routing: whether your data exits the country through a gateway that applies the filter.
The three options, ranked by hassle
| Option | Works on arrival? | Reaches blocked apps? | Best for |
|---|---|---|---|
| Travel eSIM (Airalo, Holafly, Nomad, Saily) | Yes — install before flying | Usually yes: traffic is routed abroad | Most visitors, trips under 3 weeks |
| Your home SIM on roaming | Yes | Yes — roaming traffic exits via your carrier | Short trips, business travellers on a company plan |
| Local China Unicom/Mobile SIM | No — passport + shop visit | No, unless you add a VPN | Long stays, residents, heavy data users |
For a normal one- to three-week trip, a travel eSIM is the correct answer in most cases. It costs more per gigabyte than a local SIM, and it saves you the single worst hour of a China trip: standing in a carrier shop at 21:00 with a passport and a dead phone.
How a travel eSIM bypasses the filter
A travel eSIM is a foreign SIM in every meaningful sense. Your data does not terminate on a Chinese carrier’s domestic gateway — it is tunnelled back to the provider’s home network, so Google Maps behaves as it does in Frankfurt. That is not a VPN; it is the ordinary behaviour of roaming data.
What to check before you pay
- Coverage list names both China and Hong Kong. A product called “China eSIM” often covers the mainland only; Hong Kong is a separate network.
- When validity starts. Some plans start at purchase, some at first connection. A plan that activates on purchase can expire before you land.
- Whether it is data-only. Most are. Data-only is fine — WhatsApp and iMessage work over data — but you cannot receive SMS codes to a local number you do not have.
- Whether your phone is carrier-locked. An eSIM will not install on a locked handset. Check Settings → About → Carrier lock before you travel.
If you want a local SIM anyway
Go to an official China Unicom or China Mobile store, not a kiosk. Bring your passport — registration is mandatory and the shop will photograph the passport page. A tourist SIM is typically 30 days with 20–50 GB for ¥100–200. You will need a VPN installed before you activate it, because the app stores may not load afterwards.
Wi-Fi, VPNs and the honest answer
Hotel Wi-Fi is fast and unfiltered in the sense that it is not slower — but it sits behind the same national gateway. Hotel networks are also subject to the same rules, so a VPN is still required if you are on Wi-Fi and need Google.
On VPNs: consumer VPN apps are unreliable in China because they are actively detected. The ones that survive use obfuscated protocols, cost money, and should be installed and tested at home. Free VPNs are a waste of a trip. If your work depends on access, the professional answer is a roaming SIM or a travel eSIM with a routing guarantee, not a VPN.
A five-minute setup routine before you fly
- 1Install the eSIM at home
Scan the QR code while you still have reliable internet and can call your bank if the payment flags.
- 2Download offline maps
Both Google Maps (offline area) and Amap. You will use Amap in cities; Google is better for planning.
- 3Install Alipay and WeChat
Set them up before departure. Both need SMS verification to a number you control.
- 4Screenshot your bookings
Hotel address in Chinese characters is the single most useful thing on your phone.
- 5Test the eSIM on landing
Turn off your home line, enable the eSIM as the data line, and keep data roaming ON for that line — it is required for the routing to work.