Every mobile phone to receive emergency alert: When it will happen - and what it will sayMobile phones across the UK will be sent an emergency alert as the government tests the system nationwide.
Source: Every mobile phone to receive emergency alert: When it will happen - and what it will say (https://news.sky.com/story/every-mobile-phone-to-receive-emergency-alert160when-it-will-happen-and-what-it-will-say-13393683)