These are instructions on how to find your iPhone Bootloader version using BBUpdaterExtreme. You can use these instructions to determine if an unlock is possible on an accidentally upgraded iPhone 3G.
Before you begin please have MobileTerminal and OpenSSH installed from Cydia. You can find MobileTerminal in the Terminal Support section of Cydia. For instructions on [...]

These are instructions on how to install and use the RiP Dev Icy Installer application.

- How to Install Icy
- How to Install an Application
- How to Remove an Application

HOW TO INSTALL ICY
Step One
Press to launch Cydia from the SpringBoard.
Step Two
Press to select the Manage tab from the bottom of the screen.
Step Three
Press to select the [...]

These are instructions on how to downgrade your baseband from 2.30 to 2.28 for iPhone 3Gs with the 5.8 bootloader. This will allow you to unlock your iPhone 3G using YellowSn0w. An similar exploit is still be worked on for those with a higher bootloader version…
IMPORTANT: Make sure your iPhone uses the 5.8 bootloader before [...]

These are instructions on how to find your iPhone Bootloader version using BBUpdaterExtreme and Windows. You can use these instructions to determine if an unlock is possible on an accidentally upgraded iPhone 3G. Currently only iPhones with bootloader 5.08 will be able to downgrade their baseband for the unlock.
Before you begin please have MobileTerminal and [...]

These are instructions on how to software unlock the iPhone 3G for use with any GSM cellphone carrier.
Before you can follow these instructions you must have a jailbroken iPhone and you must be on the 02.28.00 baseband(modem firmware). This means that you must be running the 2.2 firmware or have used PwnageTool(NOT QUICKPWN) to install [...]

You may come across many different articles and videos about how to unlock you iPhone, on the web. But from my experience many of these so called iPhone unlock methods are outdated, do not apply to your model, or do not work. I had a iPhone 3G that was locked to the AT&T network. I [...]

Unlocking handsets is totally legal. As long as you fullfilled your contract obligations with your service provider. Once the contract is over the phone is effectively your property and your are free to unlock it and use another network or SIM card. IF however you are still under contract with your phone your network is [...]