[engadget.com quote] Again: we can confirm with 100% certainty that
iPhoneSIMfree.com's software solution completely SIM unlocks the iPhone, is
restore-resistant, and should make the iPhone fully functional for users outside
of the US. Read on for details and links to our video, and check out the gallery
of images below.

• 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. VideoBefore 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.