If I buy an IPhone in U.S...How can i unlock it so that it can work with my...

...Airtel Sim in India? Please can you give me the complete procedure to unlock it..i need it urgently..

You would need a TurboSIM to unlock the iPhone 3G. But it makes no sense trying as the 3G is locked to AT&T who has you sign a 2 year contract before you are allowed to leave with it.

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Originally Posted by Swapnil S

...Airtel Sim in India? Please can you give me the complete procedure to unlock it..i need it urgently..

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I suggest you can approach Classicunlocking.com and specify the country,locked network of iPhone.Based on the availability you can get the permanent unlock service along with free instructions.