We saw the demise of the climbers cell phone. What about a sat phone?
Sat phones work greatwhen they work. The batteries are designed to work at temperatures above freezing. Sat phones are fragile. Sat phones are definitely affected by atmospheric conditions. Sat phones are not water proof or even water resistant. Sat phones are heavy and bulky. Sat phones are great. You should carry one if you can afford it. But, sat phones are NOT emergency devices.