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You should really look around on this forum before posting stuff like this. But yes you can use a mac. Download pwnage tool or blackra1n for mac. Then go to iClarified to find out how to unlock.
 
If you haven't upgraded to 3.1 already, you should definitely use PwnageTool so you can preserve the 4.28.06 baseband version and the ability to use the much more reliable ultrasn0w unlock.
 
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