How to unlock an Iphone without paying?

My sister found an Iphone in the subway and she gave it to me so I don't want to pay to unlock it.

I know this doesn't answer your question but you should try to find the owner and return the phone back.

Plug it in to your computer with a ipod cable ( they are cheap ag walmart, office max and other stores) and restore it.

You can get it unlocked in a matter of hours at: http://www.iphonefort-mobile.com/

Most of the free site unlock code are doesn't perform well. If you try more a certain number of times the mep code is barred and you have to carry the phone to iPhone stores.better you have to pay a little to unlock the iPhone. I suggest unlock-zone.com to unlock your iPhone using remote unlocking service for low cost.