You can select which network modes your mobile phone can use, eg. 3G or GSM. Your choice depends on the data speed you can achieve.
Step 1 of 6
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 6
Find "Network mode"
Tap More settings.
Step 3 of 6
Find "Network mode"
Tap Mobile networks.
Step 4 of 6
Find "Network mode"
Tap Network mode.
Step 5 of 6
Select network mode
3G (UMTS) or 4G (LTE) enables you to achieve higher data speeds than when using 2G (GSM). If you select LTE/GSM/WCDMA (Auto mode), your mobile phone automatically switches between the three network modes provided you're within range of a 3G or 4G network. If you select GSM only, you can't achieve high data speeds. If you select WCDMA only, your mobile phone can only connect to 3G networks.
Tap LTE/GSM/WCDMA (Auto mode), GSM only or WCDMA only.