IPhone 4 (4.1) Help please!

I have the Iphone 4 firmware 4.1 with the baseband 02.10.04 the phone is already jailbroken, but I’m not sure how to unlock it for it to work with a different service provider.
Can someone give me a tutorial link, or post on how to do it? Please and thank you!
Answer #1
You can’t.
Answer #2
Wait, there’s no way of doing it? :'( Is there anything that can be done? or is there anything I can follow to know if it’s going to be released (a twitter/blog? )
Answer #3
Buy a Gevey SIM or enjoy your iPod touch.
Answer #4
Has the gevey sim proven to work?
Answer #5
Ugh, just read info on the gevey sim and its not even worth it :'( you have to “reunlock” everytime you lose signal (not in a covered area, etc). I guess I’ll have to return this iPhone 4.