Millions of mobile phones across the United Kingdom blared a loud siren at exactly 3 pm on Sunday, as the government carried out a nationwide test of its emergency alert system.
The 10-second alert, accompanied by a vibration and a test message, briefly interrupted daily life — pausing England’s third ODI cricket match against South Africa and delaying kick-off in a rugby league game.
It was only the second nationwide drill since the system was introduced in 2023. Officials said the test was aimed at preparing the public for national emergencies, ranging from extreme weather to security threats.
The system has been used five times in the past two years for real emergencies. In January, 4.5 million people in Scotland and Northern Ireland received an alert during Storm Eowyn, while in February 2024, 50,000 phones were notified when a 500kg unexploded World War II bomb was discovered in southwest England.
Authorities say alerts will be used only in life-threatening situations, with messages also broadcast on TV, radio, and, where necessary, through door-to-door warnings.
Only devices connected to 4G or 5G networks received Sunday’s alert.
The government has linked the tests to wider resilience efforts in response to climate change, cyber threats, and Russia’s war in Ukraine.
