Apple iPhone 8
Select network mode
There may be different network modes available depending on where you are. The network mode influences the data speeds your phone can achieve.
Press Settings.
Press Mobile Data.
Press Mobile Data Options.
Press Voice & Data.
To turn on use of 4G primarily, press 4G.
To use 3G only, press 3G.
Press the Home key to return to the home screen.
1. 1. Find "Voice & Data"
2. 2. Select network mode
3. 3. Return to the home screen