I got the text message at 12:38 today and it seemed to light up the screen with some message but that had gone before I could orient the phone to read it. It seemed to be able to over-ride the phone being off.
Sunday afternoon I will be at the EDMES exhibition at St Katherine’s Priory (shameless plug) so it will be interesting to see if everyone’s phone goes off at the same time. What if you were at a concert or play, or in church. Is it able to sound even if the phone is on silent?
On the other hand, given the crap reception I get since O2 turned off 3G I may be in a dead zone.