There may be different network modes available depending on where you are. The network mode influences the data speeds your mobile phone can achieve.
Step 1 of 6
Find "Voice & Data"
Tap Settings.
Step 2 of 6
Find "Voice & Data"
Tap Mobile Data.
Step 3 of 6
Find "Voice & Data"
Tap Voice & Data.
Step 4 of 6
Select network mode
Tap the required network mode.
There may be different network modes available depending on where you are. Depending on the network mode selected, your mobile phone will always find the network with the highest data speed and best signal.