I upgraded my iPhone 4 software to iOS and i now get a message reading "SIM card not supported"

I upgraded my iPhone 4 software to the latest iOS version and now cannot get network coverage. I only receive a message that reads "The SIM Card inserted in this iPhone does not appear to be supported".
anyone with ideas for a possible solution?

You have a phone that is locked to a specific carrier. If it worked with your carrier before the update that means that the phone was hacked or jailbroken. Updating it "undid" the jailbreak and left the phone locked to its original carrier. There is no way to resolve this, as there is no jailbreak for iOS 7 and no way to go back to the previous version of iOS.

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I upgraded my iPhone 4 software to iOS and i now get a message reading "SIM card not supported"

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