There have been ten types of iPhone models. The original iPhone was released on June 29, 2007.iPhone 3G was released which, got upgraded with 3G wireless internet. On June 17, 2009, Apple released the iPhone 3GS which featured a compass and a 3.2 megapixel video camera. On June 24, 2010, a new version of the iPhone, the iPhone 4, was released. It has FaceTime included, and has an updated operating system that allows quicker navigation of all the features. The iPhone 4 also has more pixels on the screen than previous version of the iPhone, which makes all features such as pictures and videos look sharper. A minor upgrade to the iPhone 4 was the iPhone 4S, which came on October 14, 2011, with a new feature called Siri, which is a voice activation system. The iPhone 5 was released on September 21, 2012. The most noticeable change is its bigger 4 inch screen. On September 10, 2013, two new iPhones called the 5C and 5S were announced. They were released on September 20, 2013. The iPhone 5S has a new unlocking system called Touch ID which reads your fingerprint. The iPhone 5C is a cheaper model of the iPhone 5S which is also the first iPhone available in different colors that aren't black and white. The iPhone 6 and iPhone 6 Plus were released on September 19, 2014. They both have bigger screens than the iPhone 5, measuring at 4.7 inches and 5.5 inches, respectively. The iPhone 6S and iPhone 6S Plus were released on September 25, 2015.