Millions of phones will emit a siren sound and vibrate during the drill Events
Mobile phones will emit a siren for up to 10 seconds when the message is received Events
The drill will mark the second time the national emergency alert system has been tested Events
On Sunday September 7 at around 3pm, mobile phones connected to 4G and 5G networks will vibrate and emit a siren sound for up to 10 seconds. Events
It will mark the second test of the national emergency alert system – after the first in 2023 Events
The last UK-wide alert took place in 2023. Events
