Verizon Diam500?

[killerdosage]

ive been unlocking modding gsm phones for years...never bothered with cdma's. Until now, a friend gave me a HTC Diamond (Sprint Diam500) to unlock to Verizon for a friend of his so he can now use this phone instead of his stock bs fone. Long story short, i know very very little about the sprint verizon networks as all my focus has been on GSM.

How do i get the phone ready for Verizon use...and do i flash his info on the device somehow or go to verizon, etc etc. Im definitely willing to do the digging, but i need some basic info to get on the right path.

Ideally if someone could give a brief explaination between the 2 carriers networks, and a short step by step how to unlock to Verizon. If not please just point me in the right direction with a little detail n ill research the rest.

Thanks