Because we travel to many areas where cell phone coverage will be limited or nonexistent we have added a Delorme InReach Explorer satellite emergency communicator to our Toyota 4Runner Trail. With it, we now have two-way satellite communications at all times.
The device has many communication and GPS tracking features. The satellite communicator also includes an SOS feature that connects to a 24/7 search and rescue monitoring center which will bring emergency aid wherever we travel including to remote off-road locations. It is an extra "comfort factor" when traveling to remote locations in the West as we plan to do.