The UK Government will send a test Emergency Alert to mobile phones across the UK at around 15:00 on 7th September 2025.
Emergency Alert to be sent to mobile phones across the UK. This is the second-ever national test of the system. The alert will sound at around 3 p.m. on Sunday, 7th September.

The Emergency Alerts system is used to warn if there’s a danger to life nearby, including extreme weather. It allows vital information and advice to be sent to people rapidly in an emergency.

During the test, mobile phones will vibrate and make a loud siren sound for roughly ten seconds, even if they are set to silent. A message will also appear on phone screens, making it clear the alert is only a test. There are approximately 87 million mobile phones in the UK.

👉 For more info: https://www.gov.uk/government/news/national-emergency-alert-test-to-be-held-on-7th-september