iOS 5
Apple announced version 5.0 of its mobile operating system in June 2011, several months before it unveiled the new phone that iOS5 would launch alongside. The operating system software went through several months of beta use before becoming available for iPhones, iPads and iPod touches. The iOS 5 update is one of the biggest changes to the iPhone experience Apple has ever made. The standout new feature is Siri, the personal assistant built into iOS 5. Siri is only available on the iPhone 4S and later; the iOS 5 operating system itself can be downloaded onto the iPhone 4 and iPhone 3GS, but Sir…