Do You Carry Multiple Devices?

I am curious to know if anyone uses multiple phones. I have a Galaxy Nexus which will be replaced with a Moto X and a Company issued Blackberry Bold. Company is now giving us options to purchase our own devices while they play for the plan, so I thinking of getting the new iPhone when it drops as I need some security features that the Android phones do not have. Cool thing is they negotiated 1 year subsidized upgrades with Verizon.

So does anyone else carry an Android phone and a iPhone? Why do you carry two and what is your experience juggling between the 2 devices.