1. Find "Carrier"
2. Select a network manually
Press the indicator next to "Automatic" until the function is deactivated.
Press the required network and wait until the display tells you if you have access to the network you've selected.
3. Select a network automatically
Press the indicator next to "Automatic" until the function is activated.
4. Return to the Home screen
Press the Home key to end the session and return to the Home screen.