So are mine and so do we. We have vehicles all over the country all the time and the mobile devices in them spend a lot of time out of coverage. I know as I can see them reconnecting. If their coverage is good enough for you, then no worries. It's entirely possible that all the networks are the same. As I carry a work phone and a personal phone a lot, my experience is that all the other networks are in coverage more often. Vodafone is poor enough that I don't even try to use the company paid data for tethering.