Xiaomi Mi A1 proximity sensor not working I just got a new Mi A1, not even a week old, and in the middle of calls my cheek is turning on the loudspeaker, muting, etc. Clearly the proximity sensor is poorly calibrated/not working.

Is there any easy way to fix this or should I return for a refund?
Answer was actually pretty simple. This post suggests a couple of solutions, but the first one worked for me:


  Restart your phone.