During the past 40 years, the cellphone has gone from a bulky, heavy luxury item used solely to place phone calls to a sleek, ultralight computer used for everything from taking pictures to monitoring health.
( Read More: 10 Cool Things You Can Do With Your Smartphone)
Here's a look at how mobile devices have evolved over the past four decades and at the companies who built the items that manage our lives.
By Cadie Thompson and Jermaine Taylor
Posted 3 April 2013