Here's some iPhone 4S users who were asking about unlock for their devices, today MuscleNerd announced on his Twitter account saying that the iPhone 4S baseband bootrom has been dumped which means that we are going to see very soon an unlock for iPhone 4S...
With this good news for iPhone 4S users we expect Ultrasn0w to be released in the coming few weeks, but of course MuscleNerd is working to bring Ultrasn0w tool to all users, and here's a snapshot was taken from iPhone 4S baseband bootrom which show's that it has been dumped: 
In these days we expect to hear any word from our beloved hacker MuscleNerd, let us see what will happen next