Keep in mind that having cell phone service in an area, to make a phone call, does not mean that you will have 4G, or even 3G service for the internet. Some fringe areas just do not have full service yet, and may never have it. Approaching Silver City, NM from the north, we did not have Verizon or At&T PHONE service until we were 10 miles from the city limits. There was about a 100 mile stretch of secondary road that we could not even make a cell phone call. We ran in to the same situation along the Blue Ridge Parkway a few years ago. The again, there is the "quiet zone" in part of West Virginia and Virginia where you will never be able to receive a cell phone or WIFI signal because of Federal regulations.