The United Kingdom's mobile phone alert system is a public population warning system that uses Cell Broadcast technology.[1] The warning system is intended for use in major incidents such as flooding or terror attacks.[2] The Emergency Alert System was launched on 19 March 2023, and tested on a nationwide basis for the first time on 23 April 2023.
On 23 February 2024, the system's first non-test alert was sent to residents of Plymouth advising them to evacuate an area of the city due to the discovery of an unexploded World War II bomb in the back garden of a property.