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Published 22:50 14 Aug 2015 BST
Updated 14:57 25 Jan 2017 GMT

Rather than relying on the bars on your iPhone, the genius people over at Tech Insider came up with a clever video to show you how you can check EXACTLY how much reception you REALLY have.
Not hitting enough bars?
This will give you the heads up to move to another room.
Problem solved.
Hat tip to our brothers over at JOE.ie for this one via Tech Insider!Explore more on these topics:

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