What's happened
The UK conducted its second nationwide test of the emergency alert system on September 7, 2025, at 3pm. Mobile phones on 4G and 5G networks vibrated and emitted a siren for 10 seconds, with messages clarifying it was a drill. The system has been used in real emergencies before, including storms and WWII bomb threats.
What's behind the headline?
The recent test highlights both the importance and challenges of modern emergency alert systems. While the system successfully reached millions, reports of delayed or missed alerts reveal technical limitations, especially on older devices or those in remote areas. The government’s reliance on mobile networks makes the system vulnerable to network failures, as seen in previous real events like Storm Eowyn and the Plymouth WWII bomb. The test underscores the need for continuous infrastructure upgrades and public awareness campaigns. It also raises questions about the system’s inclusivity, given that some devices, such as older phones or those in airplane mode, will not receive alerts. The government’s efforts to coordinate with charities and inform vulnerable groups are positive steps, but the technical shortcomings suggest that emergency preparedness must extend beyond digital alerts to ensure comprehensive coverage. Future improvements should focus on redundancy, targeted messaging, and addressing device limitations to enhance public safety effectively.
What the papers say
The Mirror reports on the public reaction and technical issues during the test, noting mixed reactions and social media complaints about delayed alerts. The Independent provides context on previous uses of the system in real emergencies, emphasizing its role in severe weather warnings and evacuations. The Guardian highlights technical limitations, such as devices not receiving alerts if switched off or in airplane mode, and discusses the importance of infrastructure upgrades. All sources agree on the system’s critical role but acknowledge ongoing challenges in reliability and inclusivity, with government officials stressing the importance of regular testing and public awareness.
How we got here
The UK first tested its emergency alert system in 2023, after which it was used five times for real emergencies, such as storms and a WWII bomb threat. The system is designed to warn the public of imminent dangers through mobile alerts, TV, radio, and door-to-door notices. The recent test aims to ensure readiness for future crises.
Go deeper
Common question
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What is the UK emergency alert system test and should I be worried?
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Patrick Bosco McFadden is a British politician who has been Member of Parliament for Wolverhampton South East since 2005. A member of the Labour Party, he was briefly Shadow Secretary of State for Business, Innovation and Skills in 2010 and Shadow Ministe