Alerts are sent by text. The service simply uses the nearest cell towers to the affected area.
In an emergency, every compatible mobile phone or tablet in range will receive a text message with details of the incident and advice on how to stay safe.
Your phone or tablet may:
make a loud siren-like sound, even if it’s set on silent
read out the alert
contain a phone number or link to the GOV.UK website for more info
The alerts are totally secure.
You don’t need to register your phone number to get them. As such, they don’t reveal your location or collect any personal data.
The Emergency Alerts service works on:
iPhones running iOS 14.5 or later
Android phones and tablets running Android 11 or later (the service may work on devices running an earlier version. If you have one, you should contact your device manufacturer)
Apple Watch cellular devices running WatchOS 8.5 or later