Unlocking iphone 4s in India?

Hi, Many of my friends bought iphone 4s using the technique prescribed below, I'm not sure whether I can buy it in this way, please help me! My friend ordered apple iphone 4s for 99$ under a 2 year contract with at&t, when the product was shipped to india, he unlocked it and is using it it with the local GSM carrier. Is this process safe to buy? I've heard many of my friends are using their iphones like this! I'm willing to get it either!

Which technique?

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