Your mobile phone or tablet will vibrate and make a loud siren-like sound, even if it is set on silent.

The alert message will confirm this is a test and that you do not need to take any further action.

Regular testing ensures the system is functioning correctly, should it need to be used in a life-threatening emergency. Find out more at gov.uk/alerts.

You can opt out of the Emergency Alerts, including the national test, but you should keep them switched on for your own safety.

Emergency Alerts will warn you via your mobile or tablet if there is a life-threatening emergency nearby. Only the Government and the Emergency Services are able to send them to the UK public.

There are simple and effective steps we can all take to be more prepared for an emergency. Please visit gov.uk/prepare for advice on how you can prepare.

For more information about the importance of Emergency Alerts, you can also see view previous Samsung articles here.