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.
Tap Wireless & networks.
Tap Mobile network.
Select network automatically
To select a network automatically, tap the indicator next to "Automatic" to turn on the function.
Select network manually
To select a network manually, tap the indicator next to "Automatic" to turn off the function.
Tap OK and wait while your mobile phone searches for networks.
Tap the required network.
Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.