You landed at PVG or PEK. Your eSIM shows signal bars. You open Google Maps. It spins. You try WhatsApp. Nothing. You try any website. Some load, some do not. Here is exactly what is happening and how to fix it.
Diagnosis First: Which of These Matches Your Situation?
| What you see | What it means | Fix |
|---|---|---|
| No signal bars at all | Data Roaming is OFF or eSIM line not active | Settings, Cellular, eSIM line, Data Roaming ON |
| Signal bars, nothing loads at all | Wrong SIM set as data source | Settings, Cellular, Mobile Data, select eSIM line |
| Signal bars, BBC.com loads, Google does not | eSIM does not have international routing — firewall | Need dedicated China eSIM with HK/SG routing |
| Signal bars, some sites load very slowly | International routing working but congested | Try toggling Airplane Mode off and on |
| Everything worked then suddenly stopped | Data allowance exhausted | Check provider app for remaining data balance |
The Most Critical Check: International Routing
This is the issue that catches the most people. Your eSIM is connected to a Chinese carrier network. You have signal bars. But Google Maps, WhatsApp, Instagram, and Gmail still will not load.
This means your eSIM is connecting to China's local network but routing data through Chinese servers. Google and WhatsApp are blocked at those servers by China's firewall. The eSIM is technically working — it is just connected to the wrong data path.
The fix requires a China eSIM that specifically routes data through Hong Kong or Singapore before reaching the public internet. This is called international routing. Not all China eSIMs include it. Our China eSIM does — confirmed international routing is part of the product, not an add-on.
To test if this is your issue: open BBC.com or apple.com on your eSIM mobile data. If those load but Google does not, the eSIM is working but lacks international routing.
The Step-by-Step Fix
Step 1 — Data Roaming ON:
Settings, Cellular, tap your China eSIM line, Data Roaming, confirm it is ON. This is the cause of 70% of landing-day issues.
Step 2 — Correct data source:
Settings, Cellular, Mobile Data, confirm the China eSIM line is selected. If your home SIM is selected instead, your carrier's roaming rates apply and your eSIM is idle.
Step 3 — Force network re-registration:
Toggle Airplane Mode ON for 15 seconds, then OFF. Wait 90 seconds. Test Google Maps.
Step 4 — Manual network selection:
Settings, Cellular, Network Selection, switch from Automatic to Manual. A list of available Chinese networks appears. Select one, wait for connection, switch back to Automatic. This forces fresh registration.
Step 5 — Test international routing:
Open BBC.com on mobile data. If it loads: your eSIM has connectivity but lacks international routing for Google. You need a China-specific eSIM with confirmed Google access rather than a generic travel eSIM.
Important: Install Before You Land
If you tried to install the eSIM QR code inside China and it failed — this is expected. eSIM provider activation servers are often blocked by China's firewall. The QR code scan requires reaching external servers that may be inaccessible from inside China.
Always install your China eSIM QR code at home before boarding your flight. The profile stores on your phone and activates automatically when you land in China and connect to a Chinese network.
FAQ
My China eSIM was working, then stopped working mid-trip. What happened?
Most likely: data allowance exhausted. Check your provider's app or email for remaining balance. Second most likely: the validity period expired if you purchased a short plan and stayed longer than expected. Third: your phone switched from the eSIM line to your home SIM as the data source after a restart — check Settings, Cellular, Mobile Data to confirm the correct line is selected.
Google Maps loads but is very slow in China — is this normal?
On a China eSIM with international routing, data exits China via Hong Kong or Singapore, adding some latency compared to direct connections. Google Maps typically loads within 5–15 seconds, not instantly. This is normal for the routing architecture. If Maps never loads at all: Step 5 above — check BBC.com first to confirm international routing is active.
Can I install the China eSIM once I am already in China?
Unlikely to succeed. eSIM provider activation servers are frequently blocked by China's firewall, making QR code scanning fail inside China. If you are already in China without a working eSIM: connect to your hotel WiFi (which may or may not allow external access), attempt to scan the QR code, and if it fails contact your provider for a manual activation code that does not require reaching external servers.
Need a China eSIM that actually works? China eSIM with confirmed Google access — from $1.49. Install before landing.