Great news today for folks with a GSM iPhone 4S who are using, or planning to use, GEVEY's Ultra S product to unlock their handset. It appears the popular SIM interposer is compatible with the new iOS 5.1.1 update.
Apple released the update yesterday, equipped with a handful of bug fixes and improvements. And although its future is still a bit murky for jailbreakers, it looks like it's ok for unlockers to upgrade...