I wouldn't bet on the availability of a data plan.
I regularly drive through Alabama on the way to Florida (from Atlanta). One time, I took a wrong turn and ended up in a small town with absolutely no cell signal and closed roads everywhere. We stopped and asked a local for directions. This was SE of Dothan, AL, I think.
And several times, Google Maps has routed me through areas where I no longer have a signal (south-central AL). Once when this happened, the road it wanted me to go on was closed and it couldn't download an update. I handled this one by just driving northish, knowing that I'd hit Montgomery eventually.
I regularly drive through Alabama on the way to Florida (from Atlanta). One time, I took a wrong turn and ended up in a small town with absolutely no cell signal and closed roads everywhere. We stopped and asked a local for directions. This was SE of Dothan, AL, I think.
And several times, Google Maps has routed me through areas where I no longer have a signal (south-central AL). Once when this happened, the road it wanted me to go on was closed and it couldn't download an update. I handled this one by just driving northish, knowing that I'd hit Montgomery eventually.