Just a reminder:
In fringe areas, text messages will often get out even if you can't get a reliable signal for a voice call.
Apparently, cell phones keep trying to send a text until they succeed. They only need a tiny fraction of the bandwidth of a voice call, and only need a signal for a few moments.
I have seen a number of news reports where people were able initiate rescue by texting.
Edited by dougwalkabout (01/05/11 02:53 PM)