If you’re stupid enough like me to manage to SIM lock your G1/Dream, you might wonder how to unlock it with a PUK code seeing as there’s apparently nowhere to enter it on a G1/Dream. The process is to click ‘Emergency call’ and enter:
**05*$puk_code*$new_pin*$new_pin#
and press call. A nice sign of the times is that you can also obtain your PUK code online, with T-Mobile at least.