The UK government will re-test its emergency alerts system on 7 September at 15:00 BST. Compatible smartphones will vibrate and emit a siren sound even if silenced, warning users of imminent dangers like extreme weather or terrorist activities. Previous tests encountered technical issues, including discrepancies in alert delivery. Approximately 87 million mobile phones exist in the UK, with the alert limited to 4G and 5G smartphones. The Cabinet Office stresses the importance of testing to ensure system reliability and public familiarity, following precedents set by countries like the US and Japan.
The national system for sending emergency alerts to mobile phones in the UK will be tested again this September, with alerts intended for imminent danger situations.
The alerts will vibrate and make a siren sound for 10 seconds at 15:00 BST on 7 September, even if phones are set to silent.
Technical issues were revealed during a previous nationwide test in 2023, with some individuals not receiving alerts and others receiving multiple alerts.
The government aims to ensure the emergency alert system works properly and is familiar to the public, similar to systems in the US and Japan.
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