Sim unlocked Sprint TP2 on AT&T data charges??

[gullzway]

I am thinking of sim unlocking my spare Sprint TP2 and letting a friend use it on AT&T. My first question is "Will AT&T know he is using a Touch Pro2/Tilt2 after he puts in his SIM card?"

My other question is "If he has the cheap $10 data plan for regular smart phones, will they contact him and tell him he needs to add the $30 data plan for PDA's?"

Thanks for any knowledge you have on this!!