Leosghost - 2:29 am on Mar 15, 2013 (gmt 0)
IIRC they all try to locate the nearest relay about one time very 15 or 45 seconds ..and when they don't get a good lock ..they boost power to try to find a relay..and the battery drain is made even worse..runaway train effect till "no battery"
SMS or texts is/are sent on the back of this "keeping in touch with the mother ship" behaviour..and so should be free ( mine are ..but I have "everything unlimited included" with my carrier/ISP..
you could write an app..there is a least a market niche of one..:)
I actually thought the thread was going to be about spring break and those with XX and........"devices" and was staggered that it had got past mods :) and was then disappointed