While it was pretty easy to unlock iOS 6 running on iPhone 4S and other models running earlier version of this firmware, the official release of iOS 6.1.3 brings new questions. Is it possible to unlock iOS 6.1.3 iPhone 4S baseband 3.4.03? What methods can be used to get you to a happy ending? We are about to discuss the most popular solutions. You should know that unlocking is still illegal unless you have the official permission of your U.S. carrier. If you decide to unlock the newest operating system, you will do it at your own risk.