Mobile phone as rescue radio (Score 1)

That's exactly what many alpinists (including me) do here in the swiss alps. If something happens (or you stumble over somebody in trouble) at least half a day from the next barrack, just pray either the REGA rescue radio works (though the gov't regulations for amateur radio make those beasts so weak that murphys law applies) or your mobile. With solar driven mobile relays all over the place (many hut's and alps have them nowadays) coverage is pretty good. Enough for an SMS if voice doesn't work.