Using an eSIM in China begins after the profile is already installed. The key tasks are turning on the correct line, assigning mobile data to it and preventing the home SIM from using roaming data.
This guide covers installation before the flight and day-to-day use after arrival. Keep the plan instructions and essential travel information available offline.
NoveSIM travel eSIMs are data-only. Your usual number can stay on the primary SIM for calls and SMS, while internet-based communication uses the travel data.
Quick answer: After landing, turn on the China eSIM, choose it for Mobile Data, enable Data Roaming on that line and disable data switching. Keep the home SIM’s data roaming off, then test an ordinary webpage before diagnosing individual apps.
Top China eSIMs
Install the eSIM before departure
On iPhone
- Connect to dependable private Wi-Fi.
- Open Settings > Cellular or Mobile Service > Add eSIM.
- Scan the QR code or use the installation method supplied with the plan.
- Label the new line clearly, but delay activation if the plan’s validity begins when it is switched on.
On Android
- Connect to dependable private Wi-Fi.
- Open SIM Manager, Connections or Network & Internet, then choose Add eSIM or Add mobile plan.
- Scan the QR code or follow the provider’s installation method.
- Label the profile and leave its activation state consistent with the plan instructions.
Android menu names differ between manufacturers and software versions. Install before flying, but do not switch the plan on early when its validity starts at activation or first network connection. Never delete a successfully installed profile simply because it is not yet connected in China.
Before the aircraft lands
- Confirm that the eSIM appears in the phone’s SIM settings.
- Know the label you assigned to the travel line.
- Save the plan’s validity and activation instructions.
- Download hotel details, addresses, maps and translation files.
- Keep the eSIM installed even if it is still turned off.
If the profile is not installed yet, complete the appropriate installation steps above while connected to reliable Wi-Fi. Do not attempt repeated QR-code scans after the profile has already appeared in the phone’s SIM settings.
Connect after arrival
- Open the phone’s SIM or cellular settings.
- Turn on the China eSIM line.
- Select it as the line for mobile data.
- Enable Data Roaming for the China eSIM.
- Disable mobile-data switching between SIMs.
- Keep network selection on Automatic.
- Wait a few minutes, then open a normal webpage.
If your plan has a separate activation step, complete the procedure in the China activation guide before changing advanced settings.
Protect the home SIM from data charges
Leave the home SIM selected for calls only if you need the number. Turn off its data roaming and do not allow automatic data switching. Receiving calls or SMS can still be subject to the home carrier’s roaming tariff.
| Function | Line to use |
|---|---|
| Mobile data | China eSIM |
| Data roaming | On for China eSIM; off for home SIM |
| Calls and SMS | Home SIM if required and affordable |
| WhatsApp and other data apps | Use the China eSIM connection |
Understand app access in mainland China
A working data connection does not guarantee that every international service will load. App access can depend on routing, the partner network and current restrictions. Test a general webpage separately from the specific app.
Review the current guidance for Google services in China and prepare local or offline alternatives for navigation, communication and payments.
Use data efficiently during the trip
- Download large updates over trusted Wi-Fi.
- Use offline map areas and translation packs.
- Turn off automatic cloud photo backup when the allowance is limited.
- Check the remaining balance in the plan account.
- Verify hotspot terms before sharing data with another device.
For allowance planning, compare typical activities in the China mobile-data guide.
If the eSIM does not provide internet
- Confirm that the correct plan is active and still valid.
- Check that the China eSIM is the mobile-data line.
- Confirm Data Roaming is on for that line.
- Toggle Airplane Mode, then test again.
- If manual APN entry is required, use data.esim.
Do not delete the eSIM. Continue with the China troubleshooting guide or contact NoveSIM support.
Related Articles
FAQ
When should I turn on my China eSIM?
Follow the plan’s activation rule. In normal use, turn on the line after arrival and select it for mobile data.
Why must Data Roaming be enabled?
A travel eSIM usually connects through a partner network, so roaming must be enabled on the travel line even though the plan already covers its included data.
Can I keep my home SIM active?
Yes, but disable its data roaming and review the carrier’s prices for calls and SMS.
Should I delete and reinstall the eSIM if data fails?
No. Preserve the installed profile and check the selected line, roaming, validity, APN and network first.
Final Recommendation
Use the China eSIM as the dedicated mobile-data line and keep automatic data switching disabled.
Prepare offline information and app alternatives because connection status and service access are separate questions in mainland China.
When a problem occurs, keep the eSIM installed and test each setting in a controlled order.