Apple has filed a US patent for what appears to be some sort of iPhone nano. The design is complex, and has a display taking up one full side of the device, with a force-sensitive touch-based surface covering the other.

In the filing, phone calls, text messages, a traditional iPod music-playing interface and a UI for taking photos. The latter point is yet more evidence that Apple's preparing to throw cameras on all its products - even the smaller ones.

The images of the front display show, variously, a numeric keypad, a full QWERTY keyboard, an iPod-style clickwheel, and a clickwheel with a menu next to it.

Apple patents many concepts without them making their way to market, so there's no evidence yet that this is something you'll be able to buy in the future. However, it's an interesting insight into what the company is thinking at the current moment in time.