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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 "Network operators"
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press Mobile network.
Press Network operators.
2. Select network
If you want to select a network manually, press the indicator next to "Choose automatically" and wait while your phone searches for networks.
Press the required network.
If you want to select a network automatically, press the indicator next to "Choose automatically".
3. Return to the home screen
Press the Home key to return to the home screen.