Modern smartphones based on Android 11 equipped with many sensors that make using the device more comfortable and energy efficient. One of the key components is proximity sensorresponsible for turning off the display during phone calls when you bring the device to your ear. This prevents accidental cheek presses and saves battery power. However, users often encounter a situation where the screen does not go dark or, on the contrary, stops responding to the distance of the phone, which makes ending a call impossible without physical buttons.
The problem may lie either in a software failure after updating the operating system, or in physical contamination of the sensor or incorrect calibration. In the operating system Android 11 Google has changed some algorithms for working with sensors, which sometimes leads to incorrect operation on devices from different manufacturers, from Xiaomi to Samsung. In this article we will examine in detail the methods of diagnostics, software configuration and manual calibration that will help restore the functionality of this important module.
It is worth understanding that not all methods are universal. Some manufacturers hide engineering menus, while others rely solely on automatic adjustments. However, there are a number of proven methods that apply to most devices. Next, we will look at step-by-step guide, ranging from simple checks to deep system settings.
Diagnostics and testing the functionality of the sensor
Before you begin complex manipulations with engineering code or third-party applications, you need to make sure that the problem really lies in the sensor, and not in mechanical damage or banal dirt. Often, users install protective glass that covers the sensor operating area, usually located at the top of the screen next to the earpiece. Even a microscopic layer of dust or a greasy stain can distort the readings of infrared radiation.
For an initial check, you can use the built-in diagnostic tools that are found in many shells Android 11. For example, on smartphones Samsung there is a secret code to enter the testing menu, and on Xiaomi there is a special CIT engineering menu. These tools allow you to see raw sensor data in real time. You will see the distance value in centimeters or logical values "Near/Far".
If the values do not change when you raise your palm to the top of the screen, this is a clear sign of a malfunction or deep software failure. It's also worth checking to see if you've enabled Pocket Mode or similar anti-accident features that might interfere with the main sensor. Sometimes disabling such options in the settings solves the problem instantly.
⚠️ Attention: If you recently replaced the display or protective glass, make sure that the technician applied the hot melt adhesive correctly and did not leave any gaps in the sensor area. Unprofessional repairs are often the cause of failures.
- 🔍 Wipe the top of the screen with microfiber, paying special attention to the area above the speaker.
- 📱 Remove the protective glass or film during testing to exclude their influence.
- 🛠 Check for physical damage to the case at the top end smartphone.
Using the engineering menu for calibration
The most effective way to configure proximity sensor on Android 11 is to use the engineering menu. This is a hidden section of the system intended for developers and service engineers where manual calibration can be performed. It is accessed through a special USSD command in the Phone application. Codes vary depending on the processor and device manufacturer.
For processor-based devices MediaTek, which are often found in the budget and mid-range segment, a universal code is used. After entering the command, a menu opens where you need to find the section responsible for telemetry or single tests. There you will find the item Proximity Sensor. After starting the test, the system will ask you to cover the sensor with your hand and then remove it. Successful completion of the test is confirmed by a green indicator or the inscription "Success".
On devices with processors Qualcomm Snapdragon the path may differ. Code that opens a tabbed menu is often used. You need to go to the Hardware Testingtab, then select Sensor and find Proximity Sensor. The button Calibrationis available here. The process goes like this: you remove your hand from the sensor, press the "Far" calibration button, then cover the sensor and press "Near". After this, the data is saved into non-volatile memory.
##3646633## (for MediaTek)
##6484## (for Xiaomi/CIT)
#0# (for Samsung)It is important to note that on some models with Android 11 manufacturers have blocked access these codes through standard dialing. In this case, you may need third-party launcher applications for calls or receiving root access, which is not recommended for ordinary users for security reasons.
☑️ Calibration in the engineering menu
What to do if the code does not work?
If standard codes do not open the menu, try installing the "QuickShortcutMaker" application from the Play Market. It allows you to find hidden system activities, including engineering menus, by name. Find the "Engineer Mode" or "CIT" application in the search and launch it directly, bypassing dialing a number.
Configuration through third-party applications and resetting settings
If access to the engineering menu is closed, specialized utilities from the store come to the rescue. Google Play. There are a number of applications, such as Proximity Sensor Reset/Fix or Sensor Testthat emulate the calibration process or allow you to force reset the sensor settings. These applications work on top of the system, requesting the necessary permissions to access the equipment.
The principle of operation of such apps is simple: they read the current values, reset the calibration cache and force the system to redefine the triggering thresholds. After installing the app, you must follow the on-screen instructions, usually requiring you to close and open the sensor several times. Some utilities also offer a "Force Fix" function, which overwrites the sensor configuration files.
Alternatively, you can reset all smartphone settings to factory settings. This is a radical, but often effective method if the problem is caused by a software conflict after updating to Android 11. Before this procedure, be sure to back up your contacts and photos, as all personal data will be deleted. Resetting returns all system parameters, including sensor drivers, to their original state.
| Setting method | Complexity | Efficiency | Data loss risk |
|---|---|---|---|
| Screen clearing | Low | Medium | No |
| Engineering menu | Medium | High | No |
| Third-party applications | Low | Medium | No |
| Factory reset | High | Very high | Yes (full) |
⚠️ Attention: When using third-party applications, carefully read the permissions they request. Avoid apps with a dubious reputation that require access to your messages or contacts without explicit need.
Before resetting the settings, try simply clearing the cache of the Phone and Contacts application. Sometimes a conflict arises precisely in the dialer software, and not in the sensor itself.
Features of the sensor in Android 11 and new permissions
The operating system Android 11 has made significant changes to the privacy policy and access control to equipment. Users now have more granular control over which applications can use sensors. This may lead to a situation where a third-party messenger (for example WhatsApp or Telegram) cannot turn off the screen correctly during calls, since it does not have explicit permission to use the proximity sensor in the background.
To check the access settings, go to the Settings → Applications → Application Manager. Find the app you're making calls through and go to the "Permissions" section. Make sure that access to the sensors or phone is not restricted. In some shells, such as MIUI or OneUI, there are additional power saving settings that can “kill” the process responsible for monitoring the sensor to save battery.
Also Android 11 improved work with sensors of the "Virtual Proximity Sensor" type, which use the front camera and machine learning algorithms instead of an infrared emitter. If you have a modern device without a visible sensor window above the screen, the problem may be resolved by updating the camera software or resetting the artificial intelligence settings in the developer menu.
For advanced users, an option is available in the developer menu called "Quick settings developer tiles". By activating it, you can display the “Sensor off” switch in the notification shade, which allows you to temporarily disable certain sensors for testing. This helps to understand whether a specific sensor affects the operation of the system as a whole.
- 🔋 Disable the power saving mode for the Phone application in the battery settings.
- 🛡 Check the access rights in the "Privacy" section for all messengers.
- 🔄 Update the Google application Phone" to the latest version via the Play Market.
In Android 11, restrictions on background activity of applications can block the sensor from working in third-party calling apps. Check your battery and permission settings first.
Hardware reasons and physical repairs
When all software methods have been exhausted and the sensor is still not behaving correctly, there is a high probability of a hardware failure. The proximity sensor is a physical component consisting of an infrared LED and a photodetector. Over time, the LED may degrade, lose emission power, or the photodetector may fail due to a voltage surge or moisture.
A common cause is the sensor cable being misaligned. In modern smartphones, the sensor module is often placed on a separate cable or integrated into the top board. If the device is dropped, the connector may come off, breaking contact. In such cases, even ideal software calibration will not produce results, since the system simply does not receive data from the sensor.
Another common problem is the use of non-original display modules during repairs. Cheap screen replicas often have incompatible or low-quality proximity sensors that work with long delays or don't work at all. If the problem appears immediately after replacing the screen at the service center, you should file a claim with the technicians.
⚠️ Attention: Do not try to disassemble the smartphone yourself if you do not have experience and special tools. Damage to the cables or the seal of the case can lead to complete failure of the device.
How to check the sensor with a multimeter?
For accurate diagnostics, you need to disassemble the phone and ring the sensor contacts with a multimeter in diode testing mode. When you bring an object to the sensor, the readings should change. However, this method requires in-depth knowledge of electronics and is recommended only for professionals.
Prevention and operating recommendations
To avoid problems with the proximity sensor in the future, you should follow simple rules for using your smartphone. Regularly clean the top of the screen from dirt. Use high-quality protective glass that has special cutouts for sensors and speakers, or completely transparent models from trusted brands that do not distort the IR spectrum.
Avoid overheating of the device. Prolonged exposure to high temperatures (for example, using the navigator in direct sunlight) can negatively affect the sensitivity of the optical sensors. Also try to prevent moisture from getting into the earpiece, as condensation can temporarily block the sensor, simulating a constant approach of an object.
Periodically check for system updates. Manufacturers often release patches to correct bugs in sensor drivers. If you notice that after the next update Android 11 the sensor began to work worse, try rolling back the update to the Phone application or wait for a fix from the vendor.
When purchasing a case, make sure that it does not have bulges at the top of the screen. Some massive book covers can partially block the sensor's operating area, causing false alarms.
Why does the screen not go dark only in certain applications?
This is due to the fact that different applications use different APIs to access the sensor. The standard Phone application has priority access, while instant messengers (Viber, WhatsApp) can run in the background with restrictions. Check the permission settings for a specific application and disable battery optimization for it.
Is it possible to completely disable the proximity sensor?
You cannot completely disable it using system tools, as it is a critical safety and convenience module. However, there are applications that emulate the object's constant "moving away" from the sensor, causing the screen to light up during a call. This is convenient if you use a headset, but increases battery consumption.
Does the dark theme affect the operation of the sensor in Android 11?
No, the dark theme only affects the software rendering of the interface and has nothing to do with hardware sensors. Issues with the sensor in the dark theme are a coincidence and indicate other reasons for the malfunction.
What is "Pocket Mode" and how does it relate to the sensor?
Pocket mode is a feature that uses data from the proximity sensor and accelerometer to lock the screen when the phone is in a bag or pocket. If the sensor is dirty, this function may work falsely, blocking the screen while using the phone in your hands.
Will flashing the phone help?
Flashing (installing a clean version of Android) can help if the cause is deeply damaged system files or drivers. However, if the problem is hardware (the sensor is broken, the cable has become unstuck), flashing it will not have any effect and will only waste your time.