Millions of people across the UK will receive an Emergency Alert on their phones and tablets on Sunday.
The alert is part of a Government trial and will see devices emit a loud alarm and vibrate at 3pm on April 23, in a nationwide test of the new public alert system.
A message will be received on 4G and 5G mobile phones, along with sound and vibration for up to 10 seconds and it's been advised that the alarm will sound even if the device is set on silent.
