IPhone 3G JailBreak Software?

I Have An iPhone3G Thats
IOS 4.2.1
Modem Firmware 05.15.04
Next To The Version Number Is (8C148)
Can Someone Provide A Link On Where I Can Get The Software To Jailbreak It
Thanks
P.S
Can You Also Provide A Link (If You Know One) On How To Unlock It

Check http://www.unlockiphoneheaven.com

I unlocked my Iphone with them and it's working perfectly.

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http://attiphoneunlocker.com/ Official, Permanent, Apple unlock that remove any network restrictions your iPhone may have.

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