moosekhalil - September 27, 2012 at 5:20pm
i just upgraded my fathers iphone 4S 5.1.1 to ios 6. it did have the gevey sim in it and was unlocked before i did the upgrade.
after it upgraded it detected 'no sim' i ejected and inserted sim tray a couple times, then it detected the network. success! i was so relieved when it worked. i guess the 4s has to have been unlocked by the gevey prior to upgrading. hope this helped.