4G option
Why they take the 4G option off the iPhone 7? My service is horrible now In some areas now
iPhone 6, iOS 11
Because there is no point in permitting you to disable 4G since the 3G network is being phased out/shut down.
If there is no LTE signal available, and a 3G signal still exists, the phone will automatically switch to that.
This is controlled by your cellular carrier, not Apple.