For a phone-only trip, an eSIM that routes your data outside mainland China is usually enough: WhatsApp, Google and Instagram work without a VPN. You need a VPN for a laptop on hotel Wi-Fi, for any Chinese SIM or Wi-Fi, and as a backup if the eSIM fails.
- Your phone
- Chinese network
- Great Firewall
- Google, WhatsApp: blocked
- Your phone
- Chinese network
- Gateway outside mainland China
- Google, WhatsApp: work
- What decides it is where your data leaves the network, not where you bought the eSIM.
- Hotel and café Wi-Fi in China is filtered. A roaming eSIM doesn't help on Wi-Fi.
- A VPN works on any connection but can be disrupted, and it's hard to install once you're in China.
- If losing access would be a problem, set up both before you fly.
How each one gets past the firewall
Roaming eSIM
Your phone connects to a Chinese mobile network, but your data is carried to a gateway outside mainland China before it reaches the internet. Holafly calls this home-routed roaming, and Airalo describes it as routing through gateways outside mainland China. The filtering happens on the mainland internet, so traffic that leaves first isn’t filtered, and blocked apps work.
Not every plan works this way. If a plan hands you a mainland Chinese connection, blocked apps stay blocked. Even providers disagree about their own plans: Saily’s China page says WhatsApp needs a VPN, while independent tests found it working. Check our eSIM comparison for each plan’s routing and the evidence behind it.
VPN
A VPN app encrypts your traffic and sends it to a server outside China. It works on any connection: a Chinese SIM, hotel Wi-Fi or a roaming eSIM. China actively disrupts VPN traffic, so connections can drop or slow down, and some providers stop working for weeks at a time.
Which to pick
| Situation | What to use |
|---|---|
| Phone only, trip of up to two weeks | eSIM that routes abroad |
| Laptop work on hotel Wi-Fi | VPN, or the eSIM’s hotspot if the plan allows it |
| Staying a month or more | VPN, plus a local SIM with a Chinese number |
| You can’t afford to lose access | Both |
If you’d rather roam on your home SIM, see our guides to Google Fi, T-Mobile, Verizon, AT&T, Vodafone UK, EE, Telstra and Optus.
On a work trip, check each app you rely on: Microsoft Teams, Outlook, Gmail, Google Workspace, Zoom, Slack, LinkedIn and GitHub.
What catches people out
- Wi-Fi takes over. Your phone joins hotel Wi-Fi automatically, and WhatsApp stops. Turn Wi-Fi off, or switch on your VPN. See VPN for hotel Wi-Fi in China.
- Installing in China. VPN websites are blocked and VPN apps are missing from Chinese app stores. Install and test before you leave.
- Local SIM cards need your passport to register, and they’re filtered like Wi-Fi.
Set up both, in this order
- Buy the eSIM and install it at home over Wi-Fi.
- Install a VPN on your phone and laptop, sign in, and test it.
- When you land, switch mobile data to the eSIM and turn on data roaming.
- Turn Wi-Fi off and open WhatsApp. If it doesn’t connect, turn on the VPN.
FAQ
Does a roaming eSIM work on my laptop?
Only through your phone's hotspot, if the plan allows it. All four China plans we track do, though Holafly caps hotspot use at 1 GB a day.
Can I use my home SIM instead?
Yes, if your carrier offers roaming in China. Roaming data from your home carrier is usually routed back home, so blocked apps tend to work. It often costs more than a travel eSIM.
Do I need a VPN for Alipay or WeChat?
No. Alipay and WeChat work on Chinese networks without a VPN.
Sources
- Traffic routing FAQ: home-routed roaming (Holafly), accessed Oct 8, 2026
- Stay connected in China: is a VPN required? (Airalo help center), accessed Oct 8, 2026
- China eSIM FAQ: WhatsApp needs a VPN (Saily), accessed Oct 8, 2026
- Best eSIM for China, tested in Beijing, Shenzhen and Shanghai (Gizmodo, affiliate links), July 2026