And they said it couldn't be done!

Video showing T-Mobile SIM in use on the iPhone:
http://www.engadget.com/videos/iPhone/iPhone-unlock-hd.mp4

"Notes on the install:
   * The unlock process took only a couple of minutes. From our end it was
totally painless.

   * Once you put your new, non AT&T SIM in the device, you have to go
through the usual activation process. This can, of course, be done by anyone
anywhere with the right tools (like iASign or iActivator)

   * We tested with an active T-Mobile SIM -- after the hack was finished
and we reactivated we immediately got full bars and the T-Mobile carrier
info popped up in the top bar.

   * Everything is otherwise the same, except the menu system now has a
couple more options. The root menu has Carrier settings where you can select
your preferred network if you don't want to roam.

   * The General -> Network menu now has an EDGE network settings area
where you can input your carrier's APN and username / password. We put in
our T-Mobile info, and were immediately online. (Apparently these hidden
menus were added in the 1.0.1 update, they tell us. How convenient!)

   * Visual voicemail isn't in the cards -- sorry. That was, of course, to
be expected because it's a special AT&T network-specific feature right now.
When you hit the voicemail button you are taken immediately to your
carrier's default voicemail line though, and that works just like it would
on any other phone.

   * Everything is confirmed as working on a non-AT&T network: SMS send /
receive, internet (including Safari, Mail, Google maps, etc.). YouTube
doesn't work out of the box, but that's to be expected. If you're not on
AT&T you have to manually activate YouTube -- here's the guide on how to do
that. (YouTube is the only app you have to activate like this.)

   * We know, it's kind of crazy, but this isn't a hoax.

   * No, sorry, you can't have our unlocked iPhone.

Restore / upgrade resistance:

   * The iPhoneSIMfree.com guys claim this method is restore and upgrade
resistant. We have no way of knowing whether Apple will be able to disable
this SIM unlock with future iPhone software updates, but we can confirm that
it is restore-resistant.

   * We performed a full restore (v1.0.2) on our iPhone and successfully
activated it using an inactive AT&T SIM.

   * After fake-activating our iPhone, you merely pop out the AT&T SIM, put
in the foreign SIM of your choosing, reactivate, and you're done. "Boom," as
Steve might say.

   * Restoring from an iPhone backup in iTunes worked perfectly despite the
lock and foreign SIM. The only thing to notice was the phone number is now
listed as "n/a" in iTunes. Big whoop.

   * No, seriously. You can't have our unlocked iPhone.

Video
Before you get in a tizzy claiming it's a faked video, please note that:
   * We show the T-Mobile SIM at the beginning and end.

   * The video stream does get cropped toward the end. That's actually just
a crop to make sure the phone number on the second iPhone isn't shown. No
frames of the video stream were removed, it wasn't a cut.

   * Just so you could be extra sure it's real, we even left in the GSM
radio noise.

   * Dude, you can unlock your own iPhone soon, ok? You can't have ours."

I just found the newest Iphone SimUnlocking method.
NO turbocard or other harware needed.
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http://iphone.h18.ru/index.htm