1. Find "Network operators"
Slide your finger down the display starting from the top edge of your mobile phone.
Press the settings icon.
Press Network & Internet.
Press Mobile networks.
Press Network operators.
2. Select network
To select network manually, press Search networks.
Wait while your mobile phone searches for networks within range and press the required network.
To select network automatically, press Automatic.
3. Return to the Home screen
Press the home icon to end the session and return to the Home screen.