Choose a network
You can set your mobile phone to find a network automatically or you can choose a network manually. If you select a network manually, the network connection will be lost if you're out of range of the selected network.
Find "Network operators"
Slide two fingers downwards starting from the top the screen.
Tap the settings icon.
Tap Mobile networks.
Tap Network operators.
Select network manually
Tap the indicator next to "Select automatically" to turn off the function and wait while your mobile phone searches for networks.
Tap the required network.
Select network automatically
Tap the indicator next to "Select automatically" to turn on the function.
Return to the home screen
Tap the Home key to return to the home screen.