Is there any new technological way to do this nowdays?
How do you blacklist it?
You can remove the battery or, if the battery is soldered into place, wait a day or so for the battery to go flat.that will prevent it being switched off if screen is locked
You can remove the battery or, if the battery is soldered into place, wait a day or so for the battery to go flat.
Boot phone into recovery mode.
Remove any installed tracking software.
Change imei
It's easy to change the IMEI number through the Engineering Mode. No rooting needed.
*#*#3646633#*#*