Overwhelming call for phone blockers in theatres

on this oft visited topic, but I must do so. I find the ringing of mobile phones in theatres and cinemas one of the most annoying irritations of modern times. It is rare to attend a performance where this abomination does not occur. A polite message is generally always made beforehand to please switch off your phones. Are people deaf (if they are, why is the ring tone audible?), or just plain rude that they adamantly refuse to do so? What makes people so selfish they consider their phone calls more important than the comfort of the rest of the theatregoing patrons? They can't all be surgeons who are being advised that a donor heart has suddenly become available. Even more so is the completely moronic and totally selfish self-centred inconsiderate thoughtless uncaring being who absolutely MUST, dahling, ANSWER one of the bloody things - immediately. Obviously everything in their lives is soooo urgent that nothing can wait for ninety minutes (at the outside) or, if it is important, the few minutes it takes to get to the lobby and return the call. They must be heart attacks waiting to happen. I was recently at His Maj in Perth and had to endure a hurried explanation by some boorish twit (admittedly very young - say 16ish - but old enough to know better) that she COULDN'T answer her phone right now (?!?!?!?), like, cos she was, like, you know, at the Opera, like with her, like Mum and Dad. If I'd been her Dad that would have been the end of her phone for months - and they didn't even tell her to get off the phone!!!! If people are so bloody-minded that they cannot be responsible in their use of this new technology then I agree - let's get heavy handed and install blockers. Can't happen soon enough for my liking.