An emergency alert drill will send a test message to mobile phones across the UK next weekend.
It will mark the second test of the national emergency alert system – after the first in 2023.
On Sunday, September 7, at around 3pm, mobile phones connected to 4G and 5G networks will vibrate and emit a siren sound for up to 10 seconds.
Mobile phone users will also receive a message making clear that the alert is a drill.
The Government has used the system to issue real warnings five times, including in January during Storm Eowyn to warn people in Scotland and Northern Ireland about severe weather.
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Approximately 3.5 million people across Wales and south-west England received an