As most everyone knows, hackers are hard at work trying to unlock the iPhone to free it up for use anywhere in the world. Though a lot of progress has been made in getting access to the iPhone for customizations and installation of third party software, getting the iPhone to work with another service provider other than AT&T in the US has been more elusive. Recently, an Australian hacker has gotten his iPhone to make calls using Australian provider Telstra's network.
Though not an unlock, persay, Australian hacker 'ozbimmer' has tricked his iPhone into thinking it is using an AT&T SIM card while actually registering to Telstra's network. This was accomplished through creation of a custom SIM card using information taken from both an AT&T SIM card and a Telstra SIM card.
In the following video, ozbimmer demonstrates
the iPhone registering to Telstra, using his custom SIM card, and placing a call.
Either way, he's still the only guy in Australia calling folks on his iPhone.