The wonderful folks over at engadget.com have written up a quick and dirty guide to using the iUnlock program to unlock your iPhone for any carrier. Here’s a basic set of instructions:

Here’s a mirror of the iUnlock software -> here

*Copied from Engadget.com*

Quick and dirty guide to getting iUnlock running
First, you’ll need iUnlock + nor + the .fls file, which is available in ZIPs all over. We’ve got the app here, but it doesn’t have all the files necessary. Good list of links here, or try here, here, here, here, and here. This is still developing, but apparently you:

• Make sure you have firmware v1.0.2
• Drop those three files on your iPhone (and possibly chmod 555 iUnlock)
• Stop the comm center (launchctl unload -w /System/Library/LaunchDaemons/com.apple.CommCenter.plist)
• Run ./iUnlock ICE03.14.08_G.fls nor
• Watch your iPhone get unlocked?? (About 20 minutes, supposedly)
• Minicom into the tty.baseband
  minicom -s
  setup modem as /dev/tty.baseband
  type:
  AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0 [enter]
  AT+CLCK=”PN”,0,”00000000″ [enter]
  AT+CLCK=”PN”,2 [enter]
  (If you cant write in the minicom, start commcenter again and stop it again)
• Run /bin/launchctl load /System/Library/LaunchDaemons/com.apple.CommCenter.plist
• AGAIN: we CANNOT confirm this is the correct method to use iUnlock! Just what we’ve gleaned from the internets, do not consider this a guide.

Zero guarantees, people! You might be able to find more information here. Big ups to the iphone.unlock crew, Draken (who let us know our instructions should be workable at this point), and, of course, the iPhone Dev Team. Just don’t whine to us if your iPhone gets bricked. Let us know in comments if it works for you!

*Copied from Engadget.com*