Almost for the same reason it's hard to make a helicopter/submarine hybrid. There are conflicting design parameters you've got to squeeze together at a price p

Almost for the same reason it's hard to make a helicopter/submarine hybrid. There are conflicting design parameters you've got to squeeze together at a price point people are willing to accept and a design that makes it easy to use. It's a lot of gadgetry to pack into a small package. If the cries and consternation from FIC building OpenMoko is any indication, it's not easy. A testament to Apple's engineers' capabilities over phone company engineers, more than anything, perhaps.