This may be a very stupid suggestion, but have you tried calling it and talking to the robber? If not, simply report it as stolen. Text it saying you will report it
As he said in the first post, Right now it is switched off. So it's impossible to talk with the thief, and I think he will get ignored when he text the thief about reports.
The he can do-if this thread can't find someone to do this job- is report and track it using the phone IMEI.