Mobile phones across the UK will be sent an emergency alert as the government tests the system nationwide.
During the test, the second of its kind, approximately 87 million mobile devices will ring out unprompted.
The system was first tested in April 2023, but the government said some users reported that their phones did not sound, with the problem traced back to specific networks.
The test is due to happen at 3pm on Sunday 7 September.
Phones will vibrate and emit a loud siren sound for roughly 10 seconds, even if they are set to silent.
Read more about the alert on Sky News
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