Up until the launch of the iPhone 4, the aesthetic differences between the iPhone 3GS and the iPod touch have been minimal. The features are largely similar too, except for that whole cellular “phone” part of the equation. Well, you can change all that with a simple new case. At least, that’s what it sounds like with the Apple Peel 520. In effect, you can slap this case onto an iPod touch and it will convert it into a functional Apple iPhone, complete with voice calling and text messaging over a cellular network.