Troubleshooting
If your device isn't working properly, you can try several solutions to solve the problem.
In most cases you can solve the problem by following these guidelines:
1 Find "Mobile Data Options"
Press Settings.
Press Mobile Data.
Press Mobile Data Options.
2 Activate or deactivate data roaming
Press the indicator next to "Data Roaming" to activate or deactivate the function.
3 Return to the Home screen
Press the Home key to end the session and return to the Home screen.