At around 3pm on Sunday 7 September, millions of phones will vibrate and make a siren sound for around 10 seconds as Brits receive a text of fewer than 100 words.

Mobile phones will emit a siren sound for up to 10 seconds during test next month

At around 3pm on Sunday 7 September, millions of phones will vibrate and make a siren sound for around 10 seconds as Brits receive a text of fewer than 100 words.