If I unlock my verizon iPhone 4 what networks can I use it on?

I just bought an iPhone 4 off my friend for verizon, I was wondering if I unlock it what carrier could I use it on? Originally I wanted to use it on AT&T prepaid but I found out there's no sim car tray so I can't now I was thinking about using it on virgin mobile if possible. Plus does anyone have a link to where I can find out how to unlock my iPhone because it doesn't have a SIM card tray?

If its unlocked, you can use any network. If you don't know how to unlock it, just go to YouTube and search it there.

You can't use a Verizon iPhone 4 on any other network. This is because the iPhone 4 is not a world phone, and it doesn't use any type of SIM card at all on the Verizon network, while AT&T does. Sounds like you got ripped off.

As far as I know I try to see this article:
http://blackra1n.org/2011/02/is-it-possible-to-unlock-verizon-cdma-iphone-4

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