Call Proximity Sensor Fix is an Android application developed by Marco Lettieri in the Utilities & Tools category. The app is designed to fix the proximity sensor bug that many Xiaomi users face during phone calls. The app locks the screen when the phone is brought close to the ear during a call, preventing accidental call disconnections or muting of the microphone.

The app does not require root access and is free to use. It only requires some special permissions to lock the screen. If the app does not remain active in the background, users can disable battery optimizations in the app settings. Overall, Call Proximity Sensor Fix is a simple and effective solution to the proximity sensor issue faced by Xiaomi users during phone calls.