How to fix your phone screen when it's unresponsive to touch

Summary
Few things are more annoying than an unresponsive touchscreen. Before you give up on your phone, here's what to try to get it working again.
Description from Engadget.
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How to fix your phone screen when it's unresponsive to touch
Few things are more annoying than an unresponsive touchscreen. Before you give up on your phone, here's what to try to get it working again.