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 4S The uses a dual-core model that is integrated with the Apple A5 SoC in the same way as the iPad 2. Apple claims that the has up to seven times faster graphics than the iPhone 4; this was corroborated by Epic Games president Mike Capps. The has 512 MB of DDR2 RAM. Maximum available storage size increased to 64 GB while the 32 GB and 16 GB model options were retained. The screen is the same as the prior generation iPhones; , 640×960 resolution (Apple's "retina" design). There was an improvement in interactive multimedia applications compared to its predecessor. The