Modu, an Israel-based start-up ( www.modumobile.com ) has developed a miniature modular mobile phone, right, that can slip into a variety of cases or "jackets", changing both its features and functionality. The core of Modu's system is a 1.5oz mobile that works on2.5G Edge networks and fits in the palm, making it perhaps the world's smallest and lightest handset.

What really makes the Modu concept interesting is the notion that simply by slotting the phone module into a new jacket - for example, a fashion phone jacket, camera phone case or smartphone jacket complete with BlackBerry-style keyboard - it is easily and cheaply transformed.