I bought a sat phone after an experience rescuing a couple (and their two large dogs) in 20 below weather from the Battleridge campground where their truck had become stuck. That&#x27;s only 20 miles outside of Bozeman but cell service fades out long before there so they had no way to call for help. I&#x27;ve used it a few times over the years when camping and driving around the area on day trips. As you say, cell service is very much optional away from towns and the freeway.