MILLIONS of mobile phones across the UK will be sent an emergency text alert next weekend.

Phones will emit a loud siren as part of the second test of the national emergency alert system.

This will be the first time it is tested nationwide since 2023.

Devices connected to 4G and 5G networks will emit a siren sound for up to 10 seconds at around 3pm on Sunday, September 7.

Mobile phones will also vibrate during the test, and users will be sent a message to make clear that the alert is a drill.

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