I think it's a good idea, there already pre-paid but they aren't specifically adapted for children.
That true. But I should have mentioned I meant a monthly plan. He's 14 yrs old. I don' want to have to keep re-filling the phone with airtime.
That would be an excellent idea... maybe if they reach their cap, have a text message sent to their parent's phone, asking if they should get a small boost of minutes for emergencies sake. I know a number of cases where the parents just give the kids a lower end plan then up paying a huge amount for it.
I like your text message idea. No one has mentioned that before - great idea!