HT4972 Why won't my iPhone 4 recognize my sim card after update?

Why won't my iPhone 4 recognize my sim card after update?
I updated my iPhone 4 over wifi and it went through the process fine, until it switched back on and now refusese to recognize my sim card!
Any ideas?

Usually this means the phone was previously jailbroken or hacked to unlock it from the carrier it was locked to, and the update re-locked it to that carrier.

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