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It all depend on which country origin of the phone is, You can PM a support staff here with the IMEInumber on your phone so that they could assist to check on the manufacturing date or alternatively you can register for the warranty online so that you could check yourself.
Do take note online warranty registration, some country do not have that..
Aside from PM the support staff here, yo could also contact your local support team to assist you on verifying the product warranty.
Click on the link below to send them a pm, or you can click on the support link from above post to locate your local hotline to call them.
You are best to speak with your local Xperia Care team sorry as what is involved with warranty claims may vary from region to region.
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