This is not going to help you at all, but I pay the extra $30 per month. I use up to 50GB of data each month tethering, and I want to make sure the my carrier doesn't block me.
So now that I've done my service by telling you to do the right thing, you use to be able to go in using SQLLite and turn off the checker. For VZW it was around line 149 - 160. Can't remember. I would think you could do that for AT&T. Maybe someone knows? Or maybe AT&T doesn't work like that any more, of maybe KK doesn't work like that any more.
Current Phones: LG G2 and G3
Gone but not forgotten: OG Droid, Dinc, Droid Charge, Bionic, Razr Maxx & Maxx HD, SG3, M8