How can I use an old Sprint Sanyo phone with my Verizon number?

I lost my buzz, and my friend gave me her ancient one: a Sprint Sanyo. I want to use that buzz with my Verizon account & number. The verizon website said I had to call an 800 number to activate the buzz, but that did not work. Is this going to be impossible to do? If not, how do I do it?

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