I am using an Airtel Sim card on my phone and I have recently bought a new iPhone 3G on which I wish to use my current Airtel Sim Card. Actually I have tried putting my sim card in this iPhone but there was no network signals. I guess I have to unlock my iPhone 3G to use this Sim Card. Can anybody tell me how can I unlock my iPhone 3G? Is there anybody who have ever used any Airtel Sim Card on an iPhone 3G?
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