On Sunday 7 September 2025 at 3pm, the government will carry out a national test of the Emergency Alerts system. This means most mobile phones and tablets across the UK will receive a test message, accompanied by a loud siren-like sound and vibration that will last for about 10 seconds.
The message you receive will clearly state that this is a test and that no action is required on your part. The alert will come through even if your device is set to silent mode, which is an important feature of the system designed to ensure people receive warnings in genuine emergencies. Not all devices will receive the alert. Older phones or those not connected to 4G or 5G networks may not be compatible with the system.
If you wish to opt out of receiving alerts, please see here.
