Carrier shows no service after updating iphone 4

i am using iphone 4 recently i updated my iphone 4 without sim card. after getting updated. i insertd sim. it shows no sevice and when i connected it to pc on itunes it shows this message.
"The SIM card that you currently have installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier. Please contact Apple for more information."
what should i do plz help

Hello sbsutar
Check out the articles below to troubleshoot issues with No Service and Activation on your iPhone. You would need to make sure that your iPhone is using the correct carrier that it is assigned to it. If it is unlocked, then you would need to contact your carrier.
iPhone: Troubleshooting No Service
http://support.apple.com/kb/ts4429
iPhone: Troubleshooting activation issues
http://support.apple.com/kb/ts3424
Regards,
-Norm G.

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