I left AT&T because of this. My iPhone went dead data wise after 3GB of usage, on unlimited data plan. We went to arbitration and they let me out of my contract

I left AT&T because of this. My iPhone went dead data wise after 3GB of usage, on unlimited data plan. We went to arbitration and they let me out of my contract, and unlocked my phone. They clearly know they are ripping people off trying to force them to nickel and dime the tiered plans.