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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 networks"
Press SIM cards & mobile networks.
Press the required SIM.
Press Mobile networks.
2. Select network
If you want to select a network manually, press the indicator next to "Select network automatically" to turn off the function.
Press OK and your phone will search for networks.
Press the required network.
If you want to select a network automatically, press the indicator next to "Select network automatically" to turn on the function.
3. Return to the home screen
Press the Home key to return to the home screen.