1 Find "Network operators"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Mobile data.
Press Network operators.
2 Select network
If you want to select a network automatically, press Choose network automatically.
If you want to select a network manually, press Search for networks and wait while your phone searches for networks.
Press the required network.
3 Return to the home screen
Press the Home key to return to the home screen.