1 Find "SIM settings"
Slide your finger downwards starting from the top of the screen.
Press All settings.
Press Network & wireless.
Press Mobile & SIM.
Press SIM settings.
2 Select network
Press Search for networks.
If you want to select a network automatically, press automatic.
If you want to select a network manually, press the required network.
3 Return to the home screen
Press the Home key to return to the home screen.