Apple surprised us by quietly releasing a tweaked version of iOS 5.0.1 for iPhone 4S users. Though the build number (build number of original iOS 5.0.1 was 9A405) suggested that Apple may have fixed some minor bugs, the details were not available.
MacRumors has just reported that according to a new support document, Apple has fixed the annoying SIM card issues that has plagued iPhone 4S users.