Stripped naked, the Modu is slightly larger than a domino, with a small screen, a seven-­button keypad, and one gigabyte of data storage. It's a working cell phone, but it can also be popped into larger gadgets--called "jackets" and "mates"--that borrow its wireless connection, processor, and stored data. Mates are things like PDAs and GPS receivers that work fine on their own; jackets work only with the Modu inside and are mostly larger phones with added features and bigger screens.

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