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You can select which network modes your phone should use. This selection influences the data speeds you can achieve.
1. Find "Preferred network type"
2. Select network mode
If you select 3G only, your phone can only connect to 3G networks.
If you select 2G only, you can't achieve high data speeds.
If you select 3G (preferred)/2G, your phone automatically switches between 3G and 2G provided that you're within range of a 3G network.
If you select 4G (preferred)/3G/2G, your phone automatically switches between the three network modes provided that you're within range of a 3G or a 4G network.
3. Return to the home screen
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