Find "Network mode"
Slide two fingers down the display starting from the top edge of your phone.
Press SETTINGS.
Press SETTINGS.
Press More....
Press Mobile networks.
Press Network mode.
Select network mode
Press WCDMA only, GSM only or GSM / WCDMA auto.
3G (UMTS) enables you to achieve higher data speeds than when using 2G (GSM).
If you select WCDMA only, your phone can only connect to 3G networks.
If you select GSM only, you can't achieve high data speeds.
If you select GSM / WCDMA auto, your phone automatically switches between the two network modes provided that you're within range of a 3G network.
If you select WCDMA only, your phone can only connect to 3G networks.
If you select GSM only, you can't achieve high data speeds.
If you select GSM / WCDMA auto, your phone automatically switches between the two network modes provided that you're within range of a 3G network.
Return to the home screen
Press the Home key to return to the home screen.