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There may be different network modes available depending on where you are. The network mode influences the data speeds your phone can achieve.
1. Find "Preferred network mode"
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press Mobile network.
Press Preferred network mode.
2. Select network mode
Press the required network mode.
There may be different network modes available depending on where you are. If you set your phone to automatic network selection, it will always find the network with the highest data speed and best signal.
3. Return to the home screen
Press the Home key to return to the home screen.