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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 "Voice & Data"
Press Mobile Service.
Press Mobile Data Options.
Press Voice & Data.
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 the fastest network mode, it will always find the network with the highest data speed and best signal.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.