Quick Question : how to jailBreak and Unlock my Iphone 4 with 4.0.2

Hi!,
I got a iphone4 with 4.0.2 FW, can u guys help me, how can i JailBreaker and unlock it.... Do i need to update the firmware? Please Help! :(

u can find tutorials here
iClarified - Tutorials - iPhone

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Thank You a Lot! 4 the link.... I updated the FW keeping My actual BaseBand and then JB with Limera1n :D....

Thank You - Thank you!

Cheers Glad to help