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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 Mobile networks.
Press Network operators.
2. Choose network
If you want to select a network automatically, press Select automatically.
If you want to select a network manually, press Search networks.
Press the required network.
3. Return to the home screen
Press the Home key to return to the home screen.