Of course I can see how useful they could be, and that if there was a real emergency they could come in handy, but that’s not always the case. There was a story of a guy who had a parachuting accident and found himself on top of a cliff with two broken legs. He had his mobile with him but -- guess what? He wasn’t able to use it because he was in a remote area! So, in great pain, he had to pull himself along the ground with his elbows until he got to a road and could stop a motorist. So not much help for him then, was it?