United Kingdom, all smartphones will ring at 3pm tomorrow: the test for a national alarm

LONDON – At three o’clock on Sunday afternoon, all mobile phones in the UK will simultaneously transmit an alarm signal: a police siren will sound for ten seconds and the mobile will vibrate, even if it is switched off. A message will appear on the screen saying, “This is a national emergency alert test. A British government service that will warn you in the future if there is mortal danger.