Why a 10-second siren will sound on your phone on 7 September

LocalTechnology
8 Jul 2025 • 4:41 PM MYT
The Independent
The Independent

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  • The UK's Emergency Alert System is scheduled for its second national test on 7 September at 3.00pm, with millions of mobile phones expected to receive the alert.
  • Smartphones will vibrate and sound a 10-second siren, displaying a test message, as part of a system designed to warn the public of nearby life-threatening emergencies such as extreme weather or terror activity.
  • This test, the first since April 2023, is intended to strengthen the country's emergency preparedness, a measure recommended by the Covid inquiry.
  • Concerns about the alert's impact on domestic abuse victims using secret phones have led to government plans for a public information campaign on how to disable the alert.
  • Since April 2023, the system has been activated five times for real emergencies, including during major storms and the discovery of an unexploded Second World War bomb in Plymouth.

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