This hack includes using your SIM card (has to be SuperSIM - V1, U types), SIM Reader/Writer, SilverCard and some nice files to download. Unlock work on computers equipped with both Mac OS (separate procedure) or Windows operating systems.
As you can see for yourself, iPhone works nicely one continent away
After the unlock, the phone uses regular GSM or EDGE network for cellphone connectivity, or Wi-Fi connection point when EDGE connection is not available. However, there is just one small fallback - YouTube does not work. Given the limited number of results that you get on YouTube anyways, this does not seem to be a great loss.
The funniest thing of them all is the fact that you have to use iTunes to activate the iPhone, while that service is not available in Croatia at all. This is due to the fact that Europeans have more strict regs about interoperability and that Apple Croatia has other things on its mind in August. But hey, it's not that Croatia has Nokia Club as well. It's only a 4.5 million people market that owns over three million cellphones.
Ah well, at least the Iphone works. ยต
L'INQ
Hack the iPhone guide
Website that broke the news (in Croatian)