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
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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.