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How do Government emergency alerts work? Why a test system will push warning messages to phones in April
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Emergency alert alarm to sound on 23rd April in test that will trigger phones on silent – but Android and iPhone users can opt out
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How Gov got your number for emergency alert - with millions of phones to sound alarm - Mirror Online
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UK mobile phone emergency alert: Why your mobile phone alarm just sounded - Wales Online
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How to add mobile alarm number into a phone contact list - YouTube
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