IPhone (1st generation) $499, the original launch price of the 4 GB model. Apple released an SDK on March 6, 2008, allowing developers to create the apps that would be available starting in iPhone OS version 2.0, a free upgrade for iPhone users. On June 9, Apple announced the iPhone 3G, which began shipping July 11. The original iPhone was discontinued 4 days later; total sales volume came to 6,124,000 units. During release, the iPhone was marketed as running "OS X". The name of the operating system was revealed as iPhone OS with the release of the iPhone SDK. The original iPhone supported
IPhone 5 the first three days. On November 30, 2012, Apple added an unlocked version of the iPhone 5 to their online US store, with the 16 GB model starting at US$649. The iPhone 5 was officially discontinued by Apple on September 10, 2013 with the announcement of its successors, the iPhone 5s and the iPhone 5C. While the 5C shared almost the same internal hardware as the iPhone 5, the 5C used a lower-cost poly-carbonate plastic case in place of the original 5's aluminum form. The introduction of the 5C deviated from Apple's previous market strategy, where the previous iPhone model