How to unlock my iphone 4? - 1

My buddy gave me his iPhone 4 because he upgraded to the newest one. It used to be with at&t. I know you can call them and they will unlock it if you give the old at&t account number, social security number or some other stuff. But heres the thing we're no longer friends and he is well being a but and won't help me out with it so basically i can't use it until I unlock it. I want to unlock it so I can't use it with a different carrier.

Anybody know something i could download that won't hurt my computer to unlock it or a chip i can put in my phone? Anything…

iphone 4
its Modem Firmware 02.10.4
used to be with at&t

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