How to jailbreak & Unlock iPhone 3G & 3Gs iOS 4

The easiest way to jailbreak iPhone 3G & 3Gs is following these step:

1: Download a custom firmware for your iPhone:

iPhone 3G Go to this link (http://www.megaupload.com/?d=9PYUA5EW)
iPhone 3Gs Go to this link (http://www.megaupload.com/?d=N7NJURW6)

2: After download this firmware, connect your iPhone to the computer in recovery mode

then restore it as usual. Once restoring is complete, your iPhone is also already jailbroken.

3: Open Cydia then go to Manage -> Sources -> edit -> add: repo666.ultrasn0w.com -> add

After adding this source, open it up and install Ultrasn0w 0.93 then reboot your phone that's all.

Finally you have your iPhone unlocked WOOO HOO Congratulation.