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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 "Network mode"
2. Select network mode
If you select Automatic, your phone automatically switches between the two network modes provided that you're within range of a 3G network.
If you select GSM 900/1800 and GSM 850/1900, you can't achieve high data speeds.
If you select UMTS 900/2100, your phone can only connect to 3G networks.
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