android
Google To Acquire Modu Patents
It certainly is a unique concept although it was not picked up by many carriers due to its lack of appeal. Perhaps Google has some plans for future Android devices with the modular cell phone concept. Personally speaking what I can see Google achieving with this is perhaps pre-loading the device with the latest Android operating systems while other phone manufacturers provide the sleeve, possibly eliminating the problem of Android fragmentation. Alternatively it could be used for apps and games, much like how your old Nintendo Gameboys would require a cartridge to be inserted before you could play the games.
Imagine a modular cell device that contained apps specifically designed for businesses, and another for games and entertainment, the possibilities are endless, although right now it seems that the device is rather bulky, but who knows?