At 3pm on Sunday 7 September there will be a national test of the UK Emergency Alerts service. Every compatible mobile phone or tablet in range of a mast will receive the alert. They work on all 4G and 5G phone networks in the UK.
If you have a compatible mobile phone or tablet that is switched on, it may:
- make a loud siren-like sound, even if it’s set on silent
- vibrate
- read out the alert
The sound and vibration will last for about 10 seconds. Phone users will have to acknowledge the alert before they can use other features on their devices.
This may be dangerous for anyone who has a hidden phone due to domestic abuse. If you have a hidden phone, make sure to switch it off on Sunday 7 September 2025. You can also opt-out of the alert in your phone settings (Gov.uk – Opting out of emergency alerts).
