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You can select which network modes your phone can use. This setting determines the data speeds you can achieve. Follow these instructions to change network mode.
1. Find "Network Mode"
2. Select network mode
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 WCDMA (preferred)/GSM, your phone automatically switches between 3G and 2G provided that you're within range of a 3G network.
If you select 4G (preferred)/WCDMA/GSM, your phone automatically switches between the three network modes provided that you're within range of a 3G or a 4G network.
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