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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 "Mobile Data"
Press Mobile Data.
2. Select network mode
Press the indicator next to "Enable 3G" to turn the function on or off.
There may be different network modes available depending on where you are. Depending on the network mode selected, your phone 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.