Exact time millions of mobile phones across UK will emit loud alarm and vibrate on April 23 in national test of public alert system
- The system is intended for life-threatening situations including flooding and fire
- Domestic violence campaigners say victims with secret phones will be put at risk
Millions of mobile phones in the UK will emit a loud alarm and vibrate at 3pm on April 23 in a nationwide test of a new public alert system.
The alert, which will be tested on the day of the London Marathon and an FA Cup semi-final, is intended to be used in life-threatening situations such as flooding and wildfires.
The message will be received on 4G and 5G phones, 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.
But the test on St George's Day coincides with major events including the marathon and Premier League ties between Bournemouth and West Ham and Newcastle and Tottenham Hotspur kicking off at 2pm.
Domestic violence campaigners have also warned it could put people in danger by revealing the location of secret phones hidden by those at risk.
Emergency sirens will ring out from phones across the UK in a Government trial on April 23
Chancellor of the Duchy of Lancaster Oliver Dowden said: 'Getting this system operational with the national test means we have another tool in our toolkit to keep the public safe in life-threatening emergencies.
'It could be the sound that saves your life.'
National Fire Chiefs Council chairman Mark Hardingham said: 'For 10 seconds the national test may be inconvenient for some, but please forgive us for the intrusion because the next time you hear it, your life and the life-saving actions of our emergency services could depend on it.'
People who do not wish to receive the alerts will be able to opt out in their device settings, but officials hope the life-saving potential of the messages means that users will keep them on.
The National Centre for Domestic Violence (NCDV) warned people with hidden second mobile phones to turn off the alerts to avoid revealing the location of their devices.
The NCDV's Sharon Bryan said: 'Hidden second mobiles are an emergency lifeline for victims and survivors living under the constant threat of abuse, or worse.
'This siren test may unexpectedly reveal their presence to abusers - with disastrous consequences.'
The test on St George's Day coincides with major events including the London Marathon
The Government said it has been actively engaging with organisations working with vulnerable women and girls to ensure they are not adversely affected by the introduction of emergency alerts.
Officials stressed that it is easy to opt out of the system if people need their phone to stay concealed, either by turning off the alerts or simply having the phone switched off during the test.
Assistant Chief Constable Owen Weatherill, from the National Police Chiefs' Council, said: 'Alongside partners, we will continue to listen carefully to public feedback and ensure the use of emergency alerts has a positive impact.'
The new system is modelled on similar schemes currently used in the US, Canada, the Netherlands and Japan.
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