How to activate an unlocked iphone 3gs with verizon?

I bought an iphone 3gs online because i broke my phone and i didn't realize it was unlocked. I don't have a sim card, but i do have an active verizon account. How can i activate my phone?

I'm sorry but I don't think it's possible. You can go to Verizon wireless. They might have an sim card

You can't do this. The phone is GSM and you need a CDMA iPhone.