Around 3pm on Sunday afternoon, millions of phones across the UK sounded as the Government sent a nationwide emergency alert during a test for the new system.
The 10-second siren saw devices throughout Scotland and the UK vibrate one minute earlier than planned, with users required to acknowledge the alert before continuing to use their phones as normal.
However, there were a number of people who did not get the alert with some left wondering why their phone did not sound. Lots took to Twitter in a bid to find out the reason behind the issues.
