Yes ... few years ago we went to Yellowstone and Glacier national parks. We stayed at a cabin right by Lake McDonald.
Their internet happened to be out and the way its situated in the mountains, there was no cell service. We literally had no contact with the outside world for 2 days.
Glacier National Park is one of the most beautiful places I have ever seen. Look up pictures of the lake and you'll see why. There was a lot of wildlife around with plenty of hiking trails. It made for a really fun, relaxing time.
As we drove back into civilization and I got a cell signal, my phone buzzed with missed call and an accompanying message. The call took place at 2am and was from work. That made me smile.