1 Find "Network operator"
Press Settings.
Press All.
Press More.
Press Mobile network.
Press Network operator.
2 Select network
If you want to select a network automatically, press Choose automatically to turn on the function.
If you want to select a network manually, press Choose automatically to turn off the function.
Press OK and your phone will search for networks.
Press the required network.
3 Return to the home screen
Press the Home key to return to the home screen.