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.