I bought and returned a 4s and am now having trouble with my 4 (look up my posts). Anyway, when I went to the Apple store a few nights ago they checked my eligibility on a new phone and to my surprise, my ATT account still said I had the 4s. (I had to straighten that out. ugh!) But guess what the Apple store told me? I was eligible for an upgrade in May 2012. This, being that according to my account I'd upgraded to a 4s on October 14, 2011. hhmm.....