Reading this made me think (again), why the heck can't phone makers get more creative?

Android PoliceAn Experiment: My Life With A Nexus 7 As My Phone

For example, they could make phones that can be split into two pieces (in many different ways), to solve the problems that the post and its comments talk about (of size).

Remembering Modu, Israeli modular phone startup mentioned on TechCrunch some time ago  ...

http://en.m.wikipedia.org/wiki/Modu