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That message usually means that the phone has not yet contacted the carrier service company to activate the SIM card in question.
I'd advise that you call your carrier, and let them know about the message, and see if they can help you. I may be wrong, perhaps, but it is the first thing to try (if you haven't already.)
Please let me know, using the Reply To Expert function, what you think, and what happens when you try this.