History of iPhone
On January 9, 2007, Steve Jobs announced iPhone at the Macworld convention, receiving substantial media attention. Jobs announced that the first iPhone would be released later that year. On June 29, 2007, the first iPhone was released.
IPhone 5S
The iPhone 5S was discontinued on March 21, 2016, and succeeded by the iPhone SE, which continues the same form factor but features vastly upgraded internals similar to the flagship iPhone 6S. This was a break with Apple's product positioning trend (in North America and Western Europe), starting with iPhone 4S released in October 2011, which gave each newly released model one year as the flagship phone, then moving it to midrange for its second year of production, with the third and final year as the entry-level offering before discontinuation. While the iPhone 5S was expected to continue on sale until September 2016, replacing it and its A7 processor early meant that Apple "just reduced its long-term chip support window by a year" for iOS. In addition, a new iPhone launch was meant to stimulate demand, as sales of iPhone 6S and 6S Plus had not met expectations since their September 2015 release and the iPhone family was expected to suffer its first ever negative growth quarter in 2016.