irfpat wrote:any smartfone can be switched off/restart by holding the power button for more than 10 seconds. one more thing nowadays the back cover of the phone can be easily removed and disconnect the battery.
also, with the help of test point, modified custom rom can be installed with qpst qualcomm 9008 mode.

Like other suggested just file the FIR as a security precaution and get the sim blocked
Forget about the phone..
Lodge a formal complaint in police station stating both the IMEIs , your phone number etc.
Chance of getting back the phone is next to none.
Change google password and get the sim blocked ASAP.
@beamchota @jennyllwilliams @BlueFlash @magur
P.S. To stop sim fraud now incoming outgoing sms service remains disabled for 24 hours on any replacement/duplicate sim.