HT201210 hi i did update my iphone 3gs it was successful but it says that i have no sim card in it

i did update my iphone 3gs it was successful but when it restart it doesnt know my simcard, anybody can help me

Your iPhone was hacked or jailbroken to unlock it to use it on a different network. Now that you have updated the OS it has relocked to the original carrier. Call AppleCare and give them the serial and model numbers so they can tell you who it is locked to. Then contact that carrier and see if you can get the iPhone unlocked.

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