I started a project that includes a GSM module. reading the documentation I found commands :
AT+CIMI Execution command returns the value of the Internal Mobile Subscriber Identity stored in the SIM
AT+CNUM Execution command returns the MSISDN (if the phone number of the device has been stored in the SIM card)
AT+COPS? Read command returns current value of <mode>,<format> and <oper>
AT+CSCA? Read command reports the current value of the Service Center Address to be used for mobile originated SMS

with this informations colected with a script and with gsm company help may lodge a complaint at police and they can go straight to the jackass door