Rating: 4 / 5
This is one of those items that you hope you don't need, but glad to have it if you really need it. There really aren't any ultralight satellite phones that can reach out from any wilderness area, but at 13 ounces and the ability to summons help, resupply or uplink status, it might be one of those items that is worth the weight.
Typically you can get 2-3 hours talk time, or 30 hours standby time.
It has most of the features of cell phones, but with coverage anywhere in the world.