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Apple releases new versions of iPhones every year, topping themselves each time with the innovations introduced in the newer models. It is rumored to be working on iPhones with curved screens and controls that work with just the wag of a finger.

The sources say the tech won't be ready for "at least two years" and there's still a chance Apple may not follow through on the current R&D work. In terms of interface, 3D Touch -launched on the iPhone 6s -has largely failed to catch on in the way Apple originally envisioned.

Curved screens are the other new feature that Apple is reportedly working on.

The curved display Apple has in development slopes "inward gradually from top to bottom", the report notes, and could make its debut in "as little as two to three years".

Samsung now uses smartphone screens that curve, but its curved screens slope down at the edges, rather than from top to bottom. The iPhone X's OLED screen curves slightly at the bottom, but the shape is mostly invisible to the human eye. It is possible the screen would also be able to detect how far away the finger is.

And finally, Apple's exploring a technology that's similar to Samsung's Air Gestures, which lets users do things like flip through web pages by waving their hand. The approach would differ not only from devices like the iPhone X but the Samsung Galaxy S9, which is primarily flat but does wrap its display over the edges. The feature would be based on technology built into the display itself rather than via a motion sensor on the phone's bezel, like with Samsung's implementation, the person explained. Apple's design would require gestures to be closer to the screen than with Project Soli, the person familiar with the situation said.