IPhone 5S who preferred the 4-inch screen size of iPhone 5S, which remained the second-most popular iPhone after the iPhone 6 and ahead of the iPhone 6S. Apple stated in their event that they sold 30 million 4-inch iPhones in 2015, even as that form factor was succeeded as the flagship iPhone by the redesigned larger display 4.7/5.5-inch iPhone 6 and 6 Plus back in September 2014. Furthermore, the 5/5S design was regarded as "long been the golden child of Apple phone design and a benchmark for phones in general" (with the 5S's gold finish adding a premium touch to the 5's
IPhone on the O2 network in the United Kingdom, however, can buy the phone online and activate it via iTunes as with the previous model. Even where not required, vendors usually offer activation for the buyer's convenience. In the US, Apple has begun to offer free shipping on both the iPhone 3G and the iPhone 3GS (when available), reversing the in-store activation requirement. Best Buy and Walmart will also sell the iPhone. The iPhone's operating system is designed to only run software that has an Apple-approved cryptographic signature. This restriction can be overcome by "jailbreaking" the phone, which involves replacing the