Unlock iPhone 3G iOS 4.2 Baseband 5.15.04?

I have an iPhone 3G iOS 4.2 running baseband 5.15.04. Please tell me how do i unlock this to any carrier. Videos would be appreciated.

I tried to find some on youtube but I did not, you should check that later to make sure that I did not make a mistake.

http://iPhoneunlockshop.com, this is what I used all the time for my iPhones.

To Unlock I-Phone 3G from network lock to use with any GSM Network Sim card… Get the
"REMOTE I-PHONE 3G UNLOCK SERVICE " from http://www.wickedunlock.com/apple-iphone-3g/rs11wp9/ at reasonable cost and Unlock it…

You can get a factoru unlock from cutyoursim.com
sadly the only for you is to upgrade your baseband to a ipad's then unlock with ultrasnow.