Why is my Nokia Lumia 930 International Version giving me an error message?

Jan 20, 2015
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Nokia Lumia 930 Internation Version, Network locked issue.. Help

My nokia lumia 930 is an International Unlocked version which I was using with AT&T and Airtel network. I had some problem with my OS. So had to re-instal the OS from service center. Now it is not detecting any sim from any carrier. Can anyone please advice, how to resolve the sim lock/career lock.

Error message is : "The SIM card is missing or invalid. You can still make emergency calls if your mobile operator supports this".
 

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