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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 "Mobile Network"
Slide your finger downwards starting from the top of the screen.
Press Networks and Connections.
Press Mobile Network.
2. Select network
Press the field below "Network Selection Mode".
If you want to select a network automatically, press Automatic.
If you want to select a network manually, press Manual and wait while your phone searches for networks.
Press the required network.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.