If you hate the fact that AT&T is the sole reason that iPhone OS 3.0 is not going to be everything it could be at launch, take matters into your own hands and give AT&T the cold, hard, digital shoulder.  Don’t worry, you don’t have to be a master programmer or dive into system files.  All you need is a spare “dummy” AT&T phone.  With that phone do the following:  u can enable ur MMS settings… just do this…. -take sim out of...