The government has reminded members of the public to "keep calm and carry on" while the UK's emergency alerts blare out from mobile phones across the nation. Officials from the Cabinet Office National Situation Centre will send out the alert test at 3pm today (Sunday, April 23) and it will be received by every 4G and 5G device in the UK.
A major campaign has been launched to warn as many members of the public as possible about the test, in a bid to prevent panic. In a real emergency, the alarm will sound as an additional tool when there is an imminent risk to life.
However, when the alarm is heard later today - as a siren-like sound no more prominent than the loudest ringtone setting on a mobile phone - the government has reminded people it is just a test. There is no immediate danger and no action needs to be taken. Deputy Prime Minister Oliver Dowden has called for people to "keep calm and carry on" through the alarm.