Not all the features for ios6 is available for iPhone 4 -- like prankster mentioned voice Nav is only for 4s, Siri update is limited only to 4s and above. The panaromic features of the cameras is also limited to 4s and 5 -- they have removed couple of the icons and added few-- like passbook which doesn't seem to work in 4 and you have to go though a website to get it working