You can select which network modes your mobile phone can use, eg. 3G or GSM. Your choice determines the data speeds you can achieve.
Step 1 of 5
Find "Network mode"
Slide your finger down the display starting from the top edge of your mobile phone.
Tap the settings icon.
Step 2 of 5
Find "Network mode"
Tap Mobile networks.
Step 3 of 5
Find "Network mode"
Tap Network mode.
Step 4 of 5
Select network mode
3G (UMTS) or 4G (LTE) enables you to achieve higher data speeds than when using 2G (GSM). If you select LTE/WCDMA/GSM (auto connect), your mobile phone automatically switches between the three network modes provided you're within range of a 4G network. If you select WCDMA/GSM (auto connect), your mobile phone automatically switches between the two network modes provided you're within range of a 3G network. If you select WCDMA only, your mobile phone can only connect to 3G networks. If you select GSM only, you can't achieve high data speeds.
Tap LTE/WCDMA/GSM (auto connect), WCDMA/GSM (auto connect), WCDMA only or GSM only.