
I found this at
http://www.engadget.com/2007/08/23/geohot-and-crews-hardware-unlock-is-going-live/
Teenager George Hotz, aka GeoHot, the original iPhone unlocker
is back. In a post to his personal blog he states that he has
successfully unlocked a 1.1.2 firmware and bootloader 4.6 iPhone.
Better yet, he posts the not-for-dummies version of the instructions to
downgrade the bootloader to version 3.9 in preparation for running AnySim. We haven't tried this ourselves so remember, as GeoHot himself states, this hardware method "could brick your iPhone." You haven't upgraded to 1.1.3 already have you? If so, you're stuck with AT&T.
Update: We're now hearing that a software unlock for 1.1.2 / 4.6 iPhones is right around the corner. So don't crack that case just yet kids.
http://www.engadget.com/2008/01/18/1-1-2-iphones-now-unlocked-3-days-too-late/

Yes thats right, we have an unlocked iPhone. The hardware is only used to unlock
the iPhone, and can be removed after it's unlocked. Thanks to gray, iProof,
geohot, dinopio, lazyc0der, and an anonymous contributor for making this
possible. Thanks also to everyone who donated and stuck with us in
#iphone.unlock. Our group has agreed to release the method in one week. The
current method involves taking apart your phone and doing some complicated
soldering, with a high probablity of a bricked phone. Although after the phone
is unlocked all the hardware can be removed. We hope to find a software unlock
very soon. So in one week exactly from this blog post(thats less than the time
it takes to ship a turbosim) we will release simple step by step instructions
for unlocking, probably not even involving hardware. Sorry about the wait, but I
assure you it will be worth it.
I found this at
http://iphonejtag.blogspot.com/2007/08/full-hardware-unlock-of-iphone-done.html
In a video up on the Finding Jtab on the iPhone blog, a shaggy-haired young hacker holds up an iPhone and proclaims "This is the world's first unlocked iPhone."
By unlocked, he means he's gotten around having to use the iPhone with AT&T. In the video, he holds the phone up to the camera to show the T-Mobile connection indicator on the screen, makes a phone call, and then removes a T-Mobile SIM card.
He says he and his team had to take the phone apart and perform some complicated soldering, but they hope to have a software unlock figured out when they post details of their hardware unlock in a week.
Ars Technica also has a blog post up with a few guesses about how the team pulled it off.
I found this at
http://blogs.pcworld.com/staffblog/archives/005210.html