# Resolve SIM Network Issues

When you insert a SIM card, its network signal will be displayed on the status bar. If you encounter issues with data flow or connectivity, follow these troubleshooting steps:

### No Data Flow Indicated on Status Bar

* Check Mobile Data: Verify if Mobile Data is enabled. Go to 'Settings' > 'Data Usage' > 'Mobile Data' and ensure it is turned on.
* SIM Card Usability: Ensure the SIM card is active and functional. Test the SIM card in another device if necessary.
* APN Settings:
  * Navigate to 'Settings' > 'Cellular Networks' > 'Access Point Names'.
  * Verify the APN settings. Add a new APN or select an existing one according to your network provider's specifications.

### Issues Connecting to Server

* Use Ping Tool for Diagnosis:
  * Access the Ping Tool by going to 'Settings' > 'About POS' > 'POS Configuration' > 'Merchant Self Test' > 'Advance' > 'PingTool'.
  * Perform a ping test to a well-known website.
  * A successful ping indicates a functional network; a failed ping suggests an issue with the settings or network connectivity.

### Weak Signal Strength

* Test SIM Card in Another Device: If the signal is consistently weak, test the same SIM card in a different device to determine if the issue is with the signal or the terminal.