Flying light airplanes can easily take you outside of cellphone range, especially for pilots who fly in backcountry environments. A forced landing, even if successful, could leave you out of touch and with no good way to call for assistance. That can be deadly if the pilot or a passenger is injured.
This is a companion discussion topic for the original entry at https://www.avweb.com/air-shows-events/airventure/spot-emergency-satellite-comms-claim-9400-saves-over-15-years