porque
Boricua Guerrero
here's a link you need to havebump?
iClarified - Tutorials - iPhone
dont update the phone if you want to jailbreak, the latest firmware isnt jailbroken unless you tether it which means you have to plug it in to a pc when you restart it not a big problem since you hardly ever have to restart it but still not worth it
if the person giving it to you recently restored it to delete all his info then its already on the latest firmware which means a tethered jailbreak
here's how to with videos
Jailbreak 6.0, iOS 6 for iPhone 4, iPhone 3GS, iPod Touch With Redsn0w
also get cheap accessories for it from the Chinese
iPhone 4 Cases Sale - Best Accessories for iPhone 4/4s at Focalprice
Ipod Accessories, Iphone Accessories,Ipad Accessories For Sale - Free Shipping - DX