Good god I wasn't looking for a lecture on morals guys. Not that this will change your mind, but I don't see how I was stealing internet. I randomly discovered that I could get edge by entering a valid apn. No hacks, just dumb luck.
But I'll have you all know that I just called T-mobile about it and they ended up adding more minutes and 2gb data plans to all our phones for the same price I'm already paying. Thanks for all your help though!
EDIT: If you guys noticed that you were going over on your minutes every month but weren't getting charged for it, would you call up T-mobile and tell them about it? Get off your high horse.