Yep, iPhone 7 or 7+ on AT&T have an issue with a weak GPS. This causes issues with not only Follow Me and setting current RC location as the Home Point, but also many GPS running apps record inaccurate running data. This only affects 7s that are built and sold for AT&T activation. I am not positive, but I heard that some have been successful by purchasing/swapped for an unlocked iPhone 7 and then using it on AT&T. Apparently unlocked iPhone 7s are built with the better modem that is causing the issue.