The idea of modular phones or computers, where customers are expected to purchase proprietary modules to change their setup or just to upgrade, has been around since the dawn of the PC. Back in the 80's Byte magazine was filled with ads from computer manufacturers that claimed that you never had to buy a new computer, just swap out their custom (and therefore expensive) modules. Those manufacturers are, of course, not around any longer. It isn't possible to implement something like this without increasing size and manufacturing costs. *Every* time this idea gets flouted it fails miserably, but companies don't appear to learn from the past.