I'll be receiving my Sprint 650 tomorrow but would love to use it on Verizon (currently a customer). I've read through the multiple threads on Sprint 600s that were converted to Verizon. It seems that some people were able to just call Verizon and have the ESN activated. I'm thinking about just giving it a try when I get my new phone but have a couple of questions about it (independent of whether people would think it will work or not): will I need to cancel my Sprint contract to "release" the ESN for it to be available to Verizon? I want to try not to do that in the (likely) case that ESN activation on Verizon doesn't work, so that I can just give Sprint a try in my area (Denver). Any thoughts would be appreciated...