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You can set your phone to select a network automatically or you can select a network manually. If you select a network manually, your phone will lose network connection when the selected network is out of reach.
1. Find "Carrier"
Press the Navigation key.
Select the settings icon.
Select Network & Connectivity.
Select Mobile network & Data.
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.
4. Return to the home screen
Press Disconnect several times to return to the home screen.