An anonymous reader writes: A company called Modu has come up with an innovative take on a mobile phone. Instead of giving you the finished product, you get a base unit and a choice of 'sleeves', which you can plug the base unit into and turn it into a variety of 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." There's also the option to plug it into a satellite navigation device or even a car stereo but while it seems like an interesting system, I wonder whether modular devices are better than buying standalone products or all-in-one products?