Unable to answer calls on your iPhone? Try this solution

One of the issues that I face on my iPhone 6 Plus, is the inability to take incoming calls sometimes.
I face this problem when the iPhone is unlocked, and I get an option to Accept (answer) the incoming call. Sometimes I am not able to answer the call even after I tap on the Accept button several times. The Answer button is unresponsive and I typically end up missing the call.
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