By the way, this whole exploding phone thing started when the Israelis managed to get an exploding cell-phone in a bad-boy's hands. After he was dispatched the terrorists switched to pay phones.
This seems gruesome, but it is line with the Israeli policy of targeting individuals, rather than repeatedly killing women and children on buses and in restaurants. Gotta love those Israelis. I sure want them on our side in the next war - they, like we, are the good guys.
Interesting idea. Probably just somebody watching the booth from a block away with a remote detonator.