For the past 3 weeks I used my upgrade on a Galaxy S3 as a mini-stopgap between selling my iPhone 4S and getting my iPhone 5. I paid with cash. I Saturday I went to an AT&T Store to return it and they could not process the return because they didn't have any cash to pay me back. WTF? I went to 3 different AT&T stores before 1 had cash to pay me back. This was at the end of the day too... should have had plenty of business. I thought cash is king? Anyway... if any of you plan on buying your iPhone at an AT&T store on launch day... pay with a credit/debit card incase you need to make a return.