If your China eSIM is connected to a mobile network but you cannot access the internet, the problem is often related to APN settings.
Most phones configure the APN automatically during installation. However, if mobile data is not working, manually entering the correct APN usually resolves the issue.
Quick answer: if your China eSIM requires manual APN configuration, use data.esim. Leave the Username and Password fields empty, enable Data Roaming and restart your phone.
Top China eSIMs
China eSIM APN Settings
| Setting | Value |
|---|---|
| APN | data.esim |
| Username | Leave blank |
| Password | Leave blank |
| Authentication Type | None |
| Proxy | Leave blank |
| Port | Leave blank |
| MMSC | Leave blank |
| MMS Proxy | Leave blank |
| MMS Port | Leave blank |
What Is an APN?
APN stands for Access Point Name. It tells your phone how to connect to the mobile data network.
If the APN is missing or incorrect, your phone may show mobile signal but websites and apps will not load.
Do You Always Need to Enter the APN?
No. In most cases, the APN is configured automatically when you install your China eSIM.
You only need to enter the APN manually if:
- Your phone has signal but no internet.
- Mobile data never starts working.
- Your provider instructs you to enter the APN manually.
- Your phone does not automatically create the APN profile.
How to Set APN on iPhone
- Open Settings.
- Tap Cellular or Mobile Data.
- Select your China eSIM.
- Tap Cellular Data Network if available.
- Enter data.esim in the APN field.
- Leave Username blank.
- Leave Password blank.
- Save the settings.
- Restart your iPhone.
How to Set APN on Android
- Open Settings.
- Go to Network & Internet, Connections or SIM Manager.
- Select your China eSIM.
- Open Access Point Names or APN.
- Create a new APN if necessary.
- Enter data.esim.
- Leave Username and Password empty.
- Save the APN.
- Select the new APN.
- Restart your phone.
Recommended Mobile Data Settings
| Setting | Recommended Value |
|---|---|
| Mobile Data | China eSIM |
| Calls | Primary SIM |
| SMS | Primary SIM |
| Data Roaming | ON |
| Automatic Data Switching | OFF |
| Network Selection | Automatic |
Should Data Roaming Be Enabled?
Yes.
Travel eSIMs usually require Data Roaming to be enabled because they connect through supported partner networks.
Enable Data Roaming on the China eSIM while keeping it disabled on your primary SIM to avoid unexpected roaming charges.
Why the APN Might Not Work
- The APN contains spelling mistakes.
- The APN profile was not saved.
- The phone still uses another APN.
- Automatic Data Switching is enabled.
- The wrong SIM is selected for Mobile Data.
- The phone has not been restarted.
- The phone is carrier locked.
Phone Shows Signal but No Internet
If your phone has signal but websites do not load:
- Check the APN.
- Enable Data Roaming.
- Select the China eSIM for Mobile Data.
- Restart your phone.
- Enable Airplane Mode for 30 seconds.
- Keep Network Selection on Automatic.
Common APN Mistakes
- Adding spaces before or after the APN.
- Typing the APN incorrectly.
- Entering unnecessary Username or Password.
- Creating multiple APN profiles and selecting the wrong one.
- Editing the primary SIM instead of the China eSIM.
Coverage Can Also Affect Internet
If the APN is correct but internet remains slow or unavailable, your location may be the reason.
| Location | Expected Coverage |
|---|---|
| Beijing | Excellent |
| Shanghai | Excellent |
| Guangzhou | Excellent |
| Shenzhen | Excellent |
| Xi’an | Very Good |
| Chengdu | Very Good |
| Remote mountains | Variable |
| Western China | Variable to Limited |
Does WhatsApp Depend on APN?
No.
If the APN is configured correctly, WhatsApp uses the normal mobile internet connection provided by the eSIM.
Keep in mind that some online services may be affected by local internet restrictions in China rather than APN settings.
Step-by-Step APN Troubleshooting
- Verify the APN is data.esim.
- Leave Username and Password empty.
- Save the APN.
- Select the APN.
- Restart your phone.
- Enable Data Roaming.
- Select the China eSIM for Mobile Data.
- Turn Airplane Mode ON for 30 seconds.
- Reconnect to the network.
Related China eSIM Guides
- China eSIM
- Install China eSIM
- Activate China eSIM
- How to Use China eSIM
- China eSIM Not Working
- No Internet on China eSIM
- Slow China eSIM
- China Mobile Data
FAQ
What APN should I use for a China eSIM?
If manual configuration is required, use data.esim.
Should Username and Password be filled in?
No. Leave both fields empty unless your provider specifically instructs otherwise.
Do I need Data Roaming?
Yes. Data Roaming should be enabled on the China eSIM.
Why does my phone have signal but no internet?
This is usually caused by missing APN settings, incorrect Mobile Data selection or disabled Data Roaming.
Should I restart my phone after changing the APN?
Yes. Restarting your phone helps apply the new APN settings.
Can I use the same APN on iPhone and Android?
Yes. The APN data.esim is entered the same way on both platforms when manual configuration is required.
Final Recommendation
Most travelers never need to configure the APN manually because it is set automatically during installation. However, if your China eSIM has signal but no internet, entering data.esim is usually the first troubleshooting step.
After saving the APN, restart your phone, enable Data Roaming, keep Network Selection on Automatic and make sure the China eSIM is selected for Mobile Data for the best connection.