Hey everyone. I bought a used iPhone4 that the seller said was on a beta of ios6, didn't tell me which one. I hooked up to itunes today to update to ios6 final but itunes said my software is up to date? In itunes it says it's on ios6 and in my phone's about screen it says ios6 (10A403). Is this the final build or do I still need to update? Thanks for any help.