Came across this browsing the cricket forums. It's a free application that automatically flashes a CDMA iPhone 4 to page plus, cricket and a few other CDMA carriers. Looks decent and others reported success. I haven't personally tried it but I thought I'd share it here with everyone. I really wish this was around before i spent many hours manually programing my sprint iphone to page plus but im glad theres a free one out now. But anyway If you try it let us know how it went.
It's mainly for us but theoretically it can be. He would have to add more carrier support for particular Canadian carriers. But I thought it was mainly gsm up there. I know there's some CDMA but not a whole lot from my understanding.