A nationwide test of a new public alert system is taking place on Sunday - and you can watch this video to hear what it will sound like.
Millions of phones and tablets across the UK will emit a loud alarm at 3pm on Sunday. The message will be received on 4G and 5G mobile phones, along with sound and vibration for up to 10 seconds.
Phone users will be prompted to acknowledge the alert by swiping or clicking the message before being able to continue using their device. The alert system aims to warn the public if there is a danger to life nearby and is intended to be used in life-threatening situations including flooding and wildfires.
Read More: When is the mobile phone emergency alert test, what will happen and how to turn it off
The test on St George's Day coincides with major events including the London Marathon and the 2pm kick-off Premier League ties between Bournemouth and West Ham, and Newcastle and Tottenham Hotspur. Officials said they have worked with the Football Association and the marathon's organisers to make sure the impact of the test will be limited.
Meanwhile, organisers of the World Snooker Championship will pause play just before 3pm at the Crucible in Sheffield and it will resume following the alert. And the Society of London Theatre (Solt) said it had shared the Government's guidance with its members and advised them to tell attendees to turn off their phones to "minimise disruption to shows".
Harry Potter And The Cursed Child, Frozen, Mamma Mia! and The Lion King are among the shows putting on matinees on Sunday. LW Theatres, Andrew Lloyd Webber's group of seven West End theatres including the London Palladium, said it planned to make an announcement before its shows but had no plans to change the times of its matinee performances.
For cinema-goers who may be catching a film on Sunday afternoon, a Vue spokesperson said: "Before every screening at Vue, we encourage our customers to turn their mobile phones off in order to fully immerse themselves in the big screen experience. Customers who are attending a screening on Sunday afternoon will be further made aware of the UK emergency alerts test through signage in our venues and announcements before the films being shown over that period."
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