The UK is testing their phone alert alarm system again and all 4G / 5G phones will sound a loud siren alert for 10 seconds - even if on silent. This will happen at 3pm Sunday 7th September 2025.

If you have a hidden phone for an emergency, e.g. in case of domestic abuse, and don’t want the location given away, or if you’re expecting to be driving at this time and don’t want to be distracted, you need to mute it.

  • Android / IOS - settings, search for emergency broadcast, and disable them