IPhone

iPhone is a line of cell phones that contain proprietary software that is designed by Apple, Inc. The first iPhone, the 1G iPhone (I refer to the iPhones in the ordinal of release, ex. the 3G iPhone is the second iPhone.) Unfortunately, the 8th release of iPhone (iPhone 7) has no headphone jack. (Mathematically, the quasi-algebraic equation for no iPhone is: no headphone if g >= 8 where g is the number release starting with the iPhone 1) This caused controversy and some people like myself are sticking with the iPhone 6 because of the fact that iPhones have no headphone jack. There have been over 1.2 billion iPhones sold around the world since the iPhone had been released. Apple is against a practice called jailbreaking, the installation of "unauthorized" (like Apple controls your computer/phone) programs and modifications that let you get apps that Apple doesn't.