1 Find "Carrier"
Press Settings.
Press All.
Press More.
Press Mobile network.
Press Carrier.
2 Select network automatically
If you want to select a network automatically, press Choose automatically to turn on the function.
3 Select network manually
If you want to select a network manually, press Choose automatically to turn off the function.
Press OK.
Press the required network.
4 Return to the home screen
Press the Home key to return to the home screen.