1 Find "Carrier"
Press the Navigation key.
Select the settings icon.
Select Network & Connectivity.
Select Mobile network & Data.
Select Carrier.
2 Select network manually
If you want to select a network manually, select Automatic to turn off the function.
Select Off and your phone will search for available networks.
Select the required network.
3 Select network automatically
If you want to select a network automatically, select Automatic to turn on the function.
Select On.
4 Return to the home screen
Press Disconnect several times to return to the home screen.