The iPhone is among the most popular mobile phones on the market. Apple released the first generation iPhone in June 2007. Ever since the first release, the iPhone has gained a lot of popularity due to its advanced functionality and usability. The introduction of the iPhone has redefined the entire world of mobile computing. Consumers started looking for faster and more efficient phones. Various iPhone models exist now with different features and storage capabilities to serve the consumer requirements. The following table lists all the iPhone models and its initial iOS versions. With the iPhone, individuals can access e-mail, take photos and videos, listen to music, browse the Internet, and do much more. Furthermore, endless applications are available for download to extend the standard capabilities that exist on the iPhone.