Interesting. What is the best course of action for the distressed person with a cell phone? Should one attempt to climb to a higher elevation or stay put? Climbing higher will more widely broadcast the signal, but it might also widen the search area...It is pretty common to have more than one cell phone in a group. Keep them all on or shut down some for later?

To an old geezer more active back in the 70s and 80s, this is really transformative technology - with all kinds of possibilities.....