How to turn off the screen lock when calling Xiaomi Redmi 9C: all ways

Why the screen is locked during a call and how to fix it

Xiaomi Redmi 9C users often encounter a nasty feature: during a phone conversation, the screen goes out and locks, which prevents them from using touch buttons, switching between conversations or turning on speakerphone. This feature is enabled by default in MIUI to save battery power, but not everyone likes it. Especially annoying when you have to constantly unlock your smartphone to press the end button.

In this article, we’ll look at all the possible ways to disable screen locks when making calls, from standard settings to hidden MIUI functions and even ADB commands. You’ll learn how to permanently remove this lock without losing functionality, and what to do if standard methods don’t work.

Method 1: Disconnect via screen settings (official method)

The easiest and safest way is to use the built-in settings of Xiaomi Redmi 9C. It does not require superuser rights and is suitable for most versions of MIUI 12/13/14.

To turn off the screen lock during the call:

1. Open the Settings → Screen.
2. Scroll down and find the Lock section during a call (or the screen turns off during a call).
3. Switch the slider to the off position.
4. Reboot your smartphone so that the changes take effect.

If there is no such item, try an alternative path:

• 🔍 Settings → Special facilities → Physical buttons → Screen during the call
• 📱 Settings → System and device → Additionally. → Screen locking

If neither path worked, your version of MIUI doesn't support this option at the interface level, so move on to the next one.

Method 2: Use hidden MIUI settings (code ##)

Xiaomi hides some of its features behind engineering codes, one that allows you to control the behavior of the screen during calls, which works on most Redmi devices, but requires caution — wrong actions can lead to crashes.

Follow the following steps:

1. Open the Phone app.
2. Enter the combination: ##4636## (Testing menu opens).
3. Select Battery Information (or Usage Statistics in English).
4. Scroll down and find the Screen off during call.
5. Uncheck the tick or switch the slider to the Off position.

If this item is not available, try another code:

• 📞 ##36446337## (EngineerMode menu)
• 🔧 ##7378423# (service menu)

⚠️ Warning: Do not change other options in the engineering menu unless you are sure of their purpose.This can lead to unstable smartphone operation or loss of warranty.

Method 3: Disable blocking via ADB (for advanced users)

If standard methods don't work, you can use Android Debug Bridge (ADB), which requires connecting your smartphone to your computer, but doesn't need root rights. It's suitable for all versions of MIUI, including the latest ones.

Instructions:

1. Download and install ADB Tools on PC.
2. Turn it on on Redmi. 9C Debugging by USB: 🔧 Settings → The phone. → 7 times press the version MIUI (Developer mode activated). 🔧 Back to Settings → Additionally. → For developers → Turn on Debugging. USB.

Connect your smartphone to your PC and confirm the debugging permission.

ADB

adb shell settings put global proximity_delay 0

Reboot the phone.

If the locking of the screen during the call is connected to the proximity sensor, try this command as well:

adb shell settings put global proximity_on_call_disabled 1

💡

Before using ADB, check if the PC has File Transfer (MTP) mode in the smartphone notification curtain, otherwise the commands will not work.

⚠️ Attention: Teams ADB If you have problems with the proximity sensor after you do it (for example, the screen will not go out when you reach the ear), return the standard values with the command: adb shell settings delete global settings proximity_delay

Method 4: Using third-party applications (without root)

If you don't want to mess with settings or ADB, you can use Google Play apps that don't require super-user rights, but they may require additional permissions.

The best apps to disable screen locking during a call:

After installing any of these applications:

1. Open it and grant permission to Overlay over other applications.
2. Enable the Keep Screen on During Calls (or similar) option.
3. Reboot your smartphone.