The day has finally arrived. The iPhone Dev Team's hard work has paid off and users of the 3G iPhone can now unlock their devices. Right now, the software is being called a beta, and true to beta form, some users are reporting success, while others are reporting failure.The software became available over the New Year's holiday. The iPhone Dev Team bowed yellowsn0w 0.9.4 beta to users interested in freeing their iPhones from the grip of AT&T's network.

The iPhone Dev Team lists some basic information for the software:

• The unlock works exclusively with baseband 02.28.00. This baseband is provided by the latest firmware update (2.2) from Apple. You'll need to upgrade to this release using iTunes and then use QuickPwn to activate, etc. There are plenty of tutorials about this on iclarified, bigboss, and other established tutorial sites. Because it works on 02.28.00, it's available to everyone on the planet. This means we don't need to unnecessarily expose holes in earlier basebands, which is an important concern.
• The application is a small daemon that is launched on boot. It injects the payload at boot and also whenever there is a baseband reset. You won't notice anything about it other than that your third-party sim now works. It's a small program and unobtrusive. There is no GUI (this is by design).
• You can add the application using the sources outlined below. There are Cydia and Installer sources available, so use whichever you are comfortable using.
• Yellowsn0w is completely removable through Cydia, the command line, and iTunes.

As always, proceed with caution. Users already are reporting problems, and the iPhone Dev Team makes no guarantees that the software will work and not brick your iPhone. If you use the software to unlock your 3G iPhone and successfully use it on a network operator other than AT&T, be sure to chime in at the comments section and let us know how it worked out.