Staying connected in China is a little different because of the Great Firewall — Google, WhatsApp, Instagram and more are blocked. How you get online affects not just your wallet but whether those apps work at all. Here are your three options, compared.

Quick comparison

	International roaming	Travel eSIM	Local SIM card
Ease of setup	Easiest (just turn it on)	Easy (install before you fly)	Hardest (passport registration)
Cost	Most expensive	Mid / good value	Cheapest data
Keeps your home number	✅	✅ (data only)	❌ (new number)
Bypasses the firewall?	✅ Usually (routed home)	✅ Often (routes via Hong Kong)	❌ No (still need a VPN)
Best for	Short trips, convenience	Most travellers	Long stays, heavy data

1. International roaming

Switching on roaming from your home carrier is the no-effort option — your phone just works on arrival, with your usual number.

• Pro: Because roaming data is often routed back through your home network, blocked apps like Google and WhatsApp typically work without a VPN.
• Con: It’s usually the priciest way to get data, though many carriers now sell flat-rate “daily roaming” passes that soften the blow.
• Best for: Short trips, or anyone who wants zero hassle and built-in firewall bypass.

2. Travel eSIM

A travel eSIM is a digital SIM you buy and install before you fly, then activate on arrival — no physical card, no shop visit. See our best eSIM for China guide.

• Pro: Great value, instant activation, and many China/Asia eSIMs route through Hong Kong, so everyday apps work without a separate VPN. You keep your home SIM for calls and texts.
• Con: Needs an eSIM-compatible phone (most since iPhone XS / recent Android). Coverage plans are data-only.
• Best for: Most travellers. Try the Klook China eSIM (affiliate).

3. Local SIM card

Buy a physical SIM from China Mobile, China Unicom or China Telecom at the airport or a carrier shop.

• Pro: The cheapest data by far, with a local number useful for deliveries and some apps.
• Con: Requires passport registration (real-name rule), takes time, and crucially the data goes through the Great Firewall — so you still need a VPN for Google, WhatsApp and the rest.
• Best for: Longer stays and heavy data users who don’t mind the extra setup.

Bonus: the Hong Kong SIM trick

If you’re transiting through Hong Kong, there’s a brilliant option: buy a Hong Kong prepaid SIM that includes mainland China data. Because the traffic routes through Hong Kong, it’s uncensored — Google, WhatsApp and the rest work with no VPN — and there’s no passport registration. Rough 2026 prices:

• CMHK (China Mobile Hong Kong) tourist SIM — around HK$78 for ~7 GB plus voice minutes and some mainland/Macau data. CMHK local & roaming SIMs start as low as HK$38.
• China Unicom (Hong Kong) — around HK$108 for a 10-day Hong Kong + mainland plan (~3 GB), uncensored and registration-free.

Grab one at the Hong Kong airport, a 7-Eleven, or a carrier shop. It’s a long-time favourite of frequent China travellers who route through HK. (Prices are approximate — check the latest before you buy.)

A handy combo

Many travellers run two at once: a travel eSIM or roaming for firewall-free data, plus their home SIM kept on for calls and 2FA texts. On a long trip, swap in a cheap local SIM later for bulk data and pair it with a VPN.

The bottom line

• Want the easiest, firewall-free option? Roaming or a travel eSIM.
• Want the cheapest data and don’t mind a VPN? A local SIM.
• Whatever you choose, set it up before you fly where you can — and always have a VPN installed as backup.

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