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After repair ukmail delivered phone to incorrect address and phone is missing, is it possible to locate it by the IMEI number or something, any suggestions would be greatly appreciated.
Did you enable "Protection by my Xperia" before you sent the phone for repair? Other way, I don't think you can track your phone, taking into account also that when you receive the phone back from service center it is as "empty" as new. You might be able to block the IMEI so that the phone can not be used, but for that you will have to contact either your carrier or local support.
Good luck!