What to do if the proximity sensor on the Redmi 3S doesn’t work anymore

As a secondary phone I use a Redmi 3S. Recently I noticed that the proximity sensor wasn’t working anymore: when I called someone the screen wouldn’t turn off, and I was activating the device with my face, disabling the mic, placing the call on hold, opening apps, and so on…

😑😑😑

To solve this problem I had to:

  1. Turn off the phone
  2. Turning it on while pressing the “volume up” key
  3. On the engineering screen, press δΈ­ζ–‡ (chinese language), to have the menus in english. (Yes, it’s not intuitive, you have to press on δΈ­ζ–‡ for english and press on english to have chinese…)
  4. Now choose “single test” and then “proximity sensor”
  5. Keep the phone upright and with the proximity sensor not blocked and press “Calibration”
  6. Tap on “pass”, go back and tap on “power off”.
  7. Restart the phone
  8. Now we can see that the sensor it’s working, either by calling the *#*#64663#*#* (a secret app for testing will appear) or by placing a phone call ✌

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