Finally there is an unlocking method for which you need not sweat. And guess for whom? None other than our next door new neighbor T-Mobile G1.

Note: You must have one already activated T-Mobile sim card to do this.

Once you can arrage the above, follow these steps:

1. Go through setup process to link any Gmail account
2. Go to Settings > Wireless Controls > Wi-Fi Settings > Enable Wi-Fi
3. Look for a Wi-Fi network around you
4. Remove the original sim card and replace with your new unactivated sim card that came with your phone
5. Enjoy!

[source: ubergizmo.com]