SpareOne Emergency Phone

Every emergency pack should have one of these.  The SpareOne Emergency phone is a very basic GSM cell phone that runs on a single AA battery.  As long as the cell towers are working, you can make a call.  Features include a one-button emergency dial system that works even without a SIM card, a geo-location system to help you get found, 9 speed dial buttons and an LED flashlight.

For $60, everyone should have a couple of these.