Question about selling my Blackberry storm 2..?

I just upgraded to a Droid Incredible, I have just activated my new droid, so my calls now go to the droid, and not the storm 2..I am selling it on ebay, my question is, is the ESN clean now that my # is transferred to a different phone? Is there anything else I have to do? I thought I read something about calling Verizon and telling them to release a pin or something like that..Thank you!