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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"
Select the menu icon.
Select Network & Internet.
Select Mobile network.
Select Network operators and your phone will search for networks.
2. Select network manually
Select the required network.
3. Select network automatically
Select Automatically select network.
4. Return to the home screen
Press Disconnect to return to the home screen.