Ozbimmer from hackint0sh.org forums has something which iPhone fans outside the USA were waiting since quite sometime. With a little hacking he managed to connect the iPhone to his carrier in Australia. Unfortunately it is not a foolproof hack as you cannot get incoming calls or SMS. With a little modification EDGE and SMS can be used(in/out). This requires a SIM card reader/writer but if your dying to use your iPhone for something other than an MP3 player, then here is your chance!
Instructions after the jump

Instructions:
1. Get the required hardware and softwares: (these are the ones I have used): An Infinity USB unlimited SIM reader/writer, a silvercard, a PC/SC compliant USB sim reader, SIM-EMU 6.01, and WoronScan 1.09
2. Get the IMSI, Ki of your carrier using WoronScan (I will call them IMSI-b, Ki-b) and the USB sim reader
3. Use SIM-EMU and create 2 files (FLASH1 and EEPROM1) using the ICCID of the AT&T sim (ICCID-a), IMSI-b and Ki-b
3a. Insert the SMS number that your local carrier uses to send SMS
4. Then write these 2 files to create a sim using the infinity usb unlimited reader/writer and the silvercard
5. Put this sim into a normal unlocked phone and make some calls/receive calls/data services
5a. Use the software the comes with the Infinity usb unlimited read/writer to READ the Flash and EEPROM from the silvercard. This will create 2 new files (Flash2 and EEPROM2).
6. Then use SIM-EMU to change the IMSI of FLASH2 and EEPROM2 to the IMSI of AT&T sim (IMSI-a). This will create FLASH3 and EEPROM3
7. Again write the silvercard with the new flash (FLASH3) and eeprom (EEPROM3)
8. Put this sim into the iphone
9. Activate using the Cingular method as descirbe in Hacktheiphone.com
10. You can now make outgoing calls, outgoing SMS, but not incoming calls/SMS and EDGE data services (pending mod to APN).

Hackintosh via