Ok I'm not sure from your posts so far if you want help or just want to vent (which is fine) but from what I can tell it looks like Best Buy screwed up and gave you the T-mobile variant which would explain why you got the ICS OTA which Google pushed awhile ago, and as I stated the i9020XXKi1 number you posted earlier is your baseband not the model number which as far as I can tell is for T-mobile. Seems to explain why you don't get service when you pop in your ATT sim. If you could look under your battery and find the model number you will most likely find the answer.