Comment by gojomo
And you thought "Key Escrow" or "Chat Control" was bad!
Future maximum-security states may just require every mobile phone to have an explosive charge pre-installed, with the detonation-codes only available to the authorities, of course.
Then when they detect a device in active use by a [terrorist|child-pornographer|subversive|tax-evader], ka-blewie! Problem solved at the press of a button.
See also: 'Black Mirror' s3e6, 'Hated in the Nation'
Stanislav Lem wrote a short story about a tyrant that made his subjects wear highly enriched uranium earmuffs so that if more than two of them got together they would assemble a critical mass.
https://culture.pl/en/work/uranium-ears-stanislaw-lem