Why is there no option to answer to answer calls on my ZTE N817? No incoming call screen shows up or anything.

When I get an incoming call, on my home screen or lock screen, no option to answer pops up. The phone rings, I even click on the phone button and it pulls up my recent calls while still ringing! I can make calls fine. And I was able to do so at first. Then one day I couldn't.

Hmm.. Odd. Go to Settings > Apps > All > look for the Phone app, make sure it is not disabled then tap clear cache and clear data.

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