All smartphones in the UK will sound an alarm later this month in emergency test.
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Most U.K. cell phones will sound an alarm for 10 seconds later this month as the government tests a new emergency alert system.
A siren will go off at 3 p.m. local time on April 23 and last approximately 10 seconds on all 4G and 5G mobile phones.
The system is designed to broadcast urgent messages to areas that are in danger,…