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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 "GSM/UMTS Network Preferences"
Press the settings icon.
2. Select network mode
If you select GSM/WCDMA (auto-mode), 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.
3. Return to the home screen
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