Public testing of the Emergency Alerts system

Upcoming national test on 7 September 2025

The government will be carrying out a national test of the UK Emergency Alerts system on 7 September 2025 at 3pm.

The test alert will be sent to all compatible 4G and 5G mobile phones and compatible tablets across the UK.

This follows the first successful national test in April 2023.

Why the test is taking place

Regular testing ensures the system is functioning correctly, should it be needed in an emergency.

The test is not intended to alert you to real danger and you will not need to take any further action.

What the test will look and sound like

An emergency alert looks and sounds very different to other types of messages you might receive on your phone. You’ll hear a loud, siren-like sound and your phone or tablet will vibrate.

If you have a vision or hearing impairment, audio and vibration attention signals will let you know you have received the test.

Opt out of the test

You can opt out of emergency alerts, including the national test, but you should keep them switched on for your own safety. Learn more about how to opt out of emergency alerts.