I have lost my samsung galaxy core

[AC Question]

I am trying to find it since yesterday but it's only saying tha it's offline no message for exchanging the sim no nothing;;; I am in Greece

 

[B. Diddy]

Welcome to Android Central! Do you mean you're using Android Device Manager to try to find it? If the phone has been powered off, or if someone already did a factory reset, then you won't be able to find it. Did you have any other antitheft apps installed on it?