1 Find "Carrier"
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press More.
Press Mobile network.
Press Carrier and your phone will search for networks.
2 Select network
If you want to select a network automatically, press the indicator next to "Choose automatically" to turn on the function.
If you want to select a network manually, press the indicator next to "Choose automatically" to turn off the function.
Press OK.
Press the required network.
3 Return to the home screen
Press the Home key to return to the home screen.