iPhone hacks: 10 hidden Apple iOS features you need to know

The iPhone is now 10 years old. As it enters double figures, we might think we know it well – but there's a lot still hidden. Apple started selling the phone exactly 10 years ago, beginning a revolution that would see smartphones redefine many of the most fundamental parts of our lives. But for all that, the iOS software that powers iPhones is still something of a mystery. The handsets in our pockets include some of the most sophisticated software ever made – so it's no surprise that some of it is still undiscovered. The I.F.O. is fuelled by eight electric engines, which is able to push the flying object to an estimated top speed of about 120mph.