OP, sent you a PM.
Originally Posted by aiharkness
Wirelessly posted (8700g)
It has been reported here (ezrunner) that AT&T does some sort of spot checking and will charge you if you are caught tethering and not paying for it.
But how can they verify this?
To them, it should appear as a regular phone call.
PLUS....why should it matter? It's going against your plan minutes, so they are still getting their money.