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Are you sure you inserted it correctly?Have you tried xperia care?
http://www.sonymobile.com/global-en/support/contact-us/
They will answer you and they can also check it for you.
You will.You could also try contacting one of the sony support members providing them your IMEI.
I'd run your IMEI number through a site like this here - This way you will know if the number matches the handset it was released for
How did you solve this problem?