CUPERTINO, Calif. -- Apple says its next mobile operating system, iOS 7, will be available as a free download on Sept 18.
Craig Federighi, head of software at Apple Inc., said at an event at the company's Cupertino, Calif., headquarters that "downloading iOS 7 is like getting an all new device."
The new system can be downloaded on the iPhone 4 and later models, as well as on the tablets beginning with the iPad 2
Apple also says it expects to ship its 700 millionth iOS device next month. Apple CEO Tim Cook predicts that iOS 7 will become the most popular mobile operating system in the world.
The company is expected to unveil new phones later Tuesday