Texting is the rage with the kids these days. It truly is unbelievable. My niece is texting all day every day... when she's over... it's head down on the phone and that thing is buzzing non-stop. They send 1000's of text messages a month easily to each other. It's total madness.
I can see the appeal and I send a few myself if I want to get a quick message out or something, but man, the kids have taken it to a whole new level.
Pay-as-you-go seems to be a nice way to keep control on it and then have your kids earn $ to put on the phone. If they don't earn $, they don't load the phone up and can't use it.