The first-ever nationwide emergency alert test will take place today.

Millions of mobile phones and tablets across the UK will emit a loud alarm and vibrate as the Government trials a system aimed at warning the public of a danger to life.

The test message will be sent out at 3pm on Sunday, (April 23).

It will be received on all 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.

Anyone driving is urged not to read or respond to an emergency alert but instead, find somewhere safe to stop.

The AA has suggested road users may want to switch their devices off before setting off on Sunday.

The Government has also warned that the alarm will sound even if the device is set to silent.

As such, those who need to keep their phone concealed, such as domestic abuse survivors, are advised to turn off their devices or put them on airplane mode.