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where is my Xperia under setting > Xperia??
i cant find it anywhere in my Xperia SP...where is it?? 
If you can't find My Xperia under settings > Xperia, the service is not yet available for your unit. My Xperia should come as a small update through the update center app when it is available. In the meantime you can use the Google service to track your phone: