The nationwide Emergency Alert System (EAS), which sends alerts through mobile phones, will be tested later this year.
The EAS causes phones and tablets to vibrate, read the alert aloud and emit a loud siren-like sound, even if the device is on silent.
It is typically used to warn individuals about severe flooding, fires and extreme weather.
The test comes as senior government officials and the emergency services will take part in a multi-day pandemic preparedness exercise, as ministers aim to bolster the UK against future threats like COVID-19.
Cabinet Office minister Pat McFadden said the government plans to train thousands of people to be better prepared for crises like pandemics. It is expected to be held on different days over several months in the autumn, and will involve thousands of participants across the UK – including all government departments, local councils, emergency services and the devolved authorities.
Vulnerable groups, including elderly and disabled people disproportionately impacted by the pandemic, will also be provided with more support.
There is no exact date yet for when the government plans to test the EAS alarm, but it is expected to be later this year.
How does the EAS work?
The system uses mobile phone masts in local areas to broadcast an alert to every compatible mobile phone or tablet in range.
Devices do not have to be connected to mobile data or Wi-Fi to get it.
The alert lasts for around 10 seconds, and the government website recommends people keep them switched on for their own safety.
If people don’t wish to receive them, they can opt by searching “emergency alerts” in settings and turning off the notification.
When were the last alerts?
The alert has been deployed four times since it was launched in 2023.
The most recent alert was issued by the Environment Agency on 6 January 2025 to warn people at caravan parks near Barrow upon Soar in Leicestershire that the River Soar was likely to flood and cut the area off.
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Before that, on 6 December 2024, areas around Wales and southwest England were issued a warning for extremely strong winds due to Storm Darragh.
The alert system was even used by Plymouth City Council to warn locals that a World War Two bomb was going to be transported through the streets after being found in a local garden.
