An alert will be sounded in Suffolk today, and here's why.
A test of the national emergency alert system will ring out on devices at 3pm today.
The drill also took place in 2023 and has been previously used to alert around 3.5million people during Storm Darragh.
During the test, phones connected 4G and 5G networks will vibrate and sound out a siren alert for up to 10 seconds.
Mobile phone users will also receive a message making clear that the alert is a drill.
Pat McFadden, Chancellor of the Duchy of Lancaster, said: “I know Brits will keep their cool when phones across the UK make a siren-like noise today (Sunday) at 3pm.
"It’s important to remember this is only a test, just like the fire drills we all do in our schools and workplaces.
“We’re carrying out the test to make sure the system works well when we need it most, and afterwards, we’ll work with mobile network operators to assess performance.
“The test takes just 10 seconds, but it helps us keep the country safe 24 hours a day, 365 days a year.”
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