Usually I can get a text to go through when there isn't enough service for a phone call to work. However, last year while camping at KISP, I noticed I didn't have service in the campground. I'd head up to the NW corner of the island, or to the south side of the island to have service.

Getting out off the island to the north and NE side, I'd have a little service, but out near the border it was bad. I actually went into data roaming mode a few times, and I was told to be cautious if you were data roaming on any canadian towers cause you could incur charges.

And of course, if I don't have service for a text, i didn't have internet (data) coverage.