The Guinness World Records named the Modu phone as the lightest cell phone in the world. At just 1.5 ounces and 2.8 by 1.4 by 0.3 inches, the Modu is as tiny as it gets.

On its own, the Modu phone might not have a standard keypad, but it will still make calls. Put it into a ’sleeve’ or ‘jacket’ (which are essentially cases) and you can turn it into a multitude of different devices.
If, for example, you’re going out clubbing, you can pop it into a fashion sleeve with a fancy design. If you’re on a business trip and you need a phone with a Qwerty keypad and large screen, you just have to pop it into a ‘jacket’ with those features.

The idea is that when you buy the Modu phone, you’ll get a range of two or three sleeves with it and therefore you’re essentially getting three phones for the price of one.