2morecents:
First of all – Most ppl, myself included, like privacy when calling parents or friends. I dont need evryone hearing evry story and issue i discuss with them; and i like some peace and quiet wen im on the fone, its hard to hear ppl wen ur in public.
Secondly – my high school and yeshiva and camp DO NOT have payfones (obviously because they know most ppl have cell fones)
But i do agree with many things that people are saying that many kids and bochrim cannot be trusted with cellphones and ther really isnt even a need for them, but then again some ppl can