At 3 pm today (Sunday, September 7), mobile phones across the UK blared out a siren-like sound as the government conducted a nationwide test of an early warning system.

This marked the second national test of its kind, with nearly everyone owning a mobile phone or tablet receiving the alert. The alert is designed to warn Brits about potential life-threatening disasters such as extreme weather events or terrorist attacks.

It's estimated that almost 100 million phones received today's alerts. However, not everyone was alerted, leading to some confusion.

Here's why your phone might have stayed silent while those of your friends and family members rang out.

Around 95 per cent of the population would have had the 4G or 5G access needed for today's test. Those with older phones connected onl

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