
If you live in the UK and have a 4G or 5G mobile phone, then it's worth knowing that a siren-like alarm is going to sound on your handset on Sunday April 23 at 3pm BST. Yes, even if your phone is in silent mode. So what exactly is the alarm, and how can you stop it from interrupting your afternoon nap?
The alert is simply a test of the UK's new emergency alert system, which the UK government has called a "vital tool to keep the public safe in life-threatening emergencies".