if you didn’t till now - try contacting it using SMS commands. They work even without internet access.
Contact the guy/gal who’s number you entered as “friend”. Maybe he/she already received a SMS informing of a SIM change (the new number is the sender of this SMS if the sim got changed)
that’s acutally all I can recommend for the moment.
I wish you the very best on recovering your phone. We have many reports of successful phone retrievals with Anti-Theft.