premise: The IPhone 4 is only a computer.
hypothesis: The iPhone 4 is a smartphone that was designed and marketed by Apple Inc. . It was succeeded as Apple 's flagship smartphone in 2011 by the iPhone 4S . The iPhone 4S ( retroactively stylized with a lowercase 's ' as iPhone 4s as of September 2013 ) is a smartphone that was designed and marketed by Apple Inc. . During the course of its lifetime , the iPhone 4S is the best-selling iPhone ever produced and it is the first iPhone to support five major versions of iOS : iOS 5 , iOS 6 , iOS 7 , iOS 8 , and iOS 9 .