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The national system for sending emergency alerts to mobile phones will be tested for the second time this Sunday, 7 September. The alerts are designed for situations where there is an imminent danger to life, such as during extreme weather events or a terror attack. The previous test, in April 2023, revealed a number of technical issues including some users receiving multiple messages and others getting nothing at all. Technology journalist David McClelland explains what to expect to Â鶹Éç Leicester's Ady Dayman. Image: Reuters