I don't know, but what OurITLady wrote strikes most of the problems I have with BYOD idea.

Additionally, there is support for PCs and laptops. And there we would have additional nightmare of keeping devices current with our company needs. That includes software and security which we do require for everyday work.
And then there are restrictions we're enforcing in current system - websites forbidden, IMs restricted or forbidden, using of certain e-mail client... should I continue? How to enforce that on BYOD?