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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 your finger downwards starting from the top of the screen.
Press the settings icon.
Press Network & connection.
Press Mobile network.
Press Network operators.
2. Select network manually
If you want to select a network manually, press the indicator next to "Automatically select network" to turn off the function.
Press OK and your phone will search for networks.
Press the required network.
3. Select network automatically
If you want to select a network automatically, press the indicator next to "Automatically select network" to turn on the function.
4. Return to the home screen
Press the Home key to return to the home screen.