Slideshow: A History of the Smartphone in 20 Handsets
The devices that made a market
With the news that world smartphone usage total has passed the billion mark  in 20 years, we present 20 of the most important smartphones from the past 20 years.
From the very first devices - IBM's Simon and Nokia's Communicator - to the defining products from the major platforms - RIM's BlackBerry 5810, HP's iPaq h6315 and Palm's Pre - and the handsets that left industry-spanning marks - the first touchscreen smartphone, the first iPhone, the first Android device - they're all here.
How the heck could you have missed the... ?!?!?
Brings back memories, does it? Post your recollections in the Comments section. Ditto the devices you think we should have included.