There are quite a number of reasons why iPhone 3GS is rated as one of the top-selling devices nowadays. The device allows users to do a lot of things such as keep applications open in the background as well as run third-party apps or switch them without compromising its performance or battery life. This makes it easy and convenient for any user to multi-task such as sending an email while listening to a ball game or even receiving a call while playing a game. You can even organize your apps to different folders and display them on your home screen so that it would be quite easy for you to access them. With the use of the device you can also browse and shop for iBooks and customized them by their font size or brightness and according to the way you are comfortable reading them. It also have 3-megapixel still camera and video recording features that you can use to immortalize the memorable moments of your life. Jailbreak iPhone 3GS Instructions