Having your phone screen stay on while you're on a call might seem silly, but when you start accidentally hanging up calls or opening apps without thinking, it stops being funny. What's more, this glitch isn't just annoying; it can also lead to... extra battery drain, overheating, and even unintentional bumps to the phone itself if it falls due to an accidental touch.
Behind all this there is usually an old acquaintance: the proximity sensor, that small component that turns off the screen when you bring the phone to your earIf it fails, the screen won't turn off during calls (or when listening to audio in certain apps), and the experience becomes a disaster. Let's look, step by step, at all the possible causes and the most comprehensive solutions to get it working like new.
What is a proximity sensor and why is it so important?
In almost all current smartphones, the proximity sensor It's located at the top front, near the earpiece speaker, although in some recent models it's integrated under the screen itself. This component works with a light emitter and receiver (usually infrared) that calculate the distance to nearby objects, like your face when you put the phone to your ear.
When the sensor detects that something is at a very short distance, the system interprets that You don't need to use the screen and it turns it off to prevent accidental touches.This reduces energy consumption and lowers the device's temperature during calls. If, for any reason, this sensor malfunctions or stops working, the screen stays on, and that's when the problems begin.
Depending on the manufacturer, the internal workings may vary. Some phones use traditional infrared sensors, while others combine them. readings of light, movement and even ultrasound to detect proximityThere are even so-called virtual proximity sensors, which rely on the accelerometer and other data to guess whether the phone is pressed against the face. In all cases, if the system fails or It becomes uncalibratedThe screen does not turn off when making a call.
Why doesn't the screen turn off when making a call: most common causes?
When the screen stays on during a call, there's almost always a clear explanation. Most of the time it's related to... Relatively easy-to-locate faults: dirt, cases, screen protectors, incorrect settings, or faulty softwareIn more serious cases, the problem is with the hardware.
These are the most common reasons why the proximity sensor fails and the screen doesn't turn off during calls:
- Dirty or obstructed proximity sensor: dust, grease, pocket lint, makeup residue, etc.
- The case is either too thick or poorly designed. that covers the sensor area.
- Screen protector or tempered glass incorrectly applied that invades the area where the sensor is located.
- Wrong configuration of functions such as gestures when answering or pocket mode.
- software bugs: faulty updates, buggy phone apps, corrupted files, or even malware.
- Sensor miscalibrationwhich causes it to misdetect distances.
- Physical failure of the component, impacts, moisture or breaks in the area near the sensor.
Normally, you'll find a problem that's easy to fix (dirt, case, settings, or calibration). Only after you've ruled all of that out does it make sense to think that the The sensor has physically broken and will have to be repaired. technical service.
Check your mobile phone's screen and gesture settings
Before getting bogged down with calibrations and apps, it's a good idea to check if you've accidentally changed any settings on the customization layerManufacturers include options that may interfere with the Automatic screen turn-off during calls.
In many Android skins you'll find options like this “Hold the phone to your ear to answer calls” or similar gesturesThese functions use the proximity sensor itself to answer calls and, in some phones, they don't work well with the screen turning off: in the end, the sensor gets "confused" and the screen doesn't turn off when it's supposed to.
Be careful with pocket mode and similar settings
Some manufacturers, especially Chinese brands like Xiaomi, include a pocket mode or features that use the proximity sensor to prevent touches when the phone is storedAlthough the idea is good, it sometimes interferes with the sensor's normal behavior during calls.
On Xiaomi phones, for example, you can go to Settings > Lock screen and password > Advanced settings, where the following usually appears: Pocket mode, which activates proximity detection when the mobile phone is in an enclosed spaceIf this setting is incorrectly calibrated or doesn't work well with your case or screen protector, it can cause more problems than it solves.
The only option here is to test. Activate pocket mode, make a call, and check if the screen turns off correctly. Then, do the same with the mode disabled. In the end, you should leave the Choose the configuration that works best on your specific mobile device, even if it's not the one recommended by theory..
Check cases, screen protectors, and sensor cleanliness.
It may sound basic, but A poorly fitted case or screen protector is one of the most frequent culprits when the proximity sensor behaves strangely.And the good thing is that checking it takes you seconds.
Start by completely removing the phone case. Some cases, especially very thick ones or those with exaggerated edges, They invade part of the area where the sensor is located and partially or totally block the signalMake a couple of calls without the case and see if the screen turns off properly now.
Next, check the screen protector or tempered glass. Many protectors have specific cutouts for the camera and sensors, but if it's misaligned, it could be covering the proximity sensor area and causing it to read incorrect valuesIf you suspect this is the case, try removing it or replacing it with a compatible one that leaves the sensor area free.
In addition, it is essential that the sensor area is clean. Dirt accumulates throughout the day. dust, skin oil, makeup residue, pocket lint, and general dirtTo clean it, turn off your phone and use a soft cloth (the kind used to clean glasses) and, if necessary, a little isopropyl alcohol, which is safe for electronics as long as you don't soak the device.
Avoid using tissues that shed fibers or contain corrosive products, because you could scratch the screen or damage the oleophobic coatingA good cleaning done on time solves more problems than you think.
A broken screen can also affect the sensor.
If your mobile phone screen has been hit and cracked at the top, you should consider that Cracks, glass chips, or a strong impact in that area can damage the proximity sensor or prevent it from working properly..
In many cases, the user doesn't even notice that the crack passes right over the sensor area, but even if the touch panel continues to respond, the internal component may have been damaged. If there are cracks or fragments of glass located directly above it, The path of infrared light is altered and the measurements become unreliable..
When this is the case, there's little you can do on your own beyond replacing the screen assembly. It's best to contact the official technical service. a trusted repair shop to replace the entire panel and check the sensor's conditionIt's not usually the most expensive part in the world, but you have to assess whether the repair is worthwhile depending on the age of the device.
How to calibrate the proximity sensor with apps
If you've already ruled out physical problems and basic adjustments, the next logical step is Check if the sensor is out of calibration and correct its values.There are several for that. apps on Google Play which can help you both test and recalibrate the sensor.
A useful tool is an app like “Proximity Sensor Test”, which is responsible for show you the real-time reading from the proximity sensor on the screenBy moving your hand closer to and further from the top of the phone, you should see the values change (for example, going from "far" to "near" or varying the measured distance).
If the app detects normal changes when you cover and uncover the area, the sensor is likely working. However, if there are no changes, the data is erratic, or it only responds intermittently, there's a good chance that... the component is poorly calibrated or even brokenAt that point, you can use an app like "Reset Proximity Sensor" or specific tools like those from some manufacturers (for example, Fairphone has its own utility).
These types of applications usually follow a very simple guided process: they ask you to Place the phone in a specific position, cover or uncover the sensor area, and with these steps, restore the factory settings. which Android uses to interpret proximity. In many cases, after calibration and a phone restart, the screen turning off during calls starts working correctly again.
If, however, the tests indicate that the sensor does not respond in any way or that it remains "stuck" in the same state, it is quite likely that The problem is no longer software-related, but hardware-related, and you need help from a technical service..
Calibrate or test the sensor using hidden codes and diagnostic menus
Some Android phones include special diagnostic menus that are accessed through codes entered in the phone app, as if you were going to make a callFrom these menus, you can test internal components, including the proximity sensor.
In certain older models or with certain chipsets, it was possible to use a code like this *#*#0588#*#* to directly open a proximity sensor test menuHowever, this code is becoming less and less compatible and no longer works on most modern mobile phones.
Instead, each manufacturer offers its own methods. For example, on many Samsung devices you can dial *#0*# to open a full diagnostic menuWithin it, there is usually a "Sensor" section where data from the "PROXIMITY SENSOR" appears, allowing you to see if it detects near/far correctly.
On Xiaomi phones, the typical path is to go to Settings > About phone > All specifications and Tap repeatedly on “Kernel Version” to enter the CIT diagnostic menuFrom there you can search for the test related to the proximity sensor and check its operation.
If your brand doesn't offer codes or you're not sure which one to use, you can always resort to Generic diagnostic apps like "Sensor Test" directly read data from all sensors without the need for secret menus.In any case, the important thing is to verify if the sensor responds to changes in distance when you move your hand closer and further away.
Reset the sensors from the developer options
Android doesn't allow, at least not by default, turning off and then turning back on the proximity sensor as if it were an independent switch. But it is possible. Temporarily deactivate all device sensors and then reactivate them, which in practical terms works as a "reset" of the sensor array.
The process begins by enabling developer options. To do this, go to Settings > About phone and look for the section where the Build number (or similar, depending on the layer)Tap it repeatedly until the system confirms that developer options are enabled.
Next, return to the main Settings menu and enter System (or similar), where the new section should appear. Developer OptionsOnce inside, use the search bar (if your Android version allows it) and type something like "sensors disabled". Locating this option will enable a quick button in the quick settings panel that allows you to turn off all sensors.
When you activate this switch, The phone will temporarily cut off the reading of sensors such as motion, temperature, battery and, of course, proximity.After a few seconds, it disables the option to reactivate the sensors. It's a kind of forced restart that, in some cases, corrects strange proximity sensor behavior without requiring any further action.
System updates and restarts: the software side of the problem
In many mobile phones, sensor failures appear right after a system update that hasn't fully taken hold or that has introduced a bugIt could also be due to a faulty phone app or an internal failure after a long period without restarting the device.
To rule out that the problem is coming from there, go to the device's Settings, enter System (or the section used by your manufacturer) and look System updates or similarCheck if you have any pending updates and, if so, install them following the usual recommendations: battery above 50%, stable connection, and a backup just in case.
A later version of the system may fix a bug affecting the proximity sensor. If you're already updated or there's nothing new, A simple restart of the mobile phone may be enough to clear specific errors in the system.Press and hold the power button and restart normally, or if something is stuck, force a restart by holding the button down for about 10 seconds.
If you deem it necessary, you can even leave your phone turned off for a few minutes or a few hours so that certain background processes are completely unloaded and the system starts up "fresh" Afterwards. It's not magic, but it prevents many strange behaviors caused by days and days without a reboot.
Try other calling and internet calling apps
Another point to check is whether the problem occurs with all types of calls or only some. On most mobile phones, the proximity sensor's management during calls is controlled by the phone's built-in system. the manufacturer's default phone appIf that app has a bug, it can cause the screen not to turn off when you touch it.
That's why it's worth installing another phone app, like the Google Phone app or other compatible alternativeand temporarily set it as the default. Make several calls and see if the sensor behaves the same way or if, instead, the screen now turns off when you bring the phone to your ear.
Additionally, you can test it with VoIP calls, such as those from WhatsApp, Telegram, or Skype. These applications also typically use the Proximity sensor to turn off the screen when you listen to audio by holding the phone to your ear or when you make an internet callIf it fails with normal calls but works with WhatsApp, the problem may be more related to the phone app or the manufacturer's interface than to the hardware itself.
Temporary solutions: speaker and headphones
While you're struggling with the problem or if you need an emergency solution, you have some alternatives to make Calls shouldn't be a nightmare even if the screen doesn't turn off properly..
The simplest solution is to activate the phone's speakerphone during the call and hold the phone slightly away from your face. That way, even if the sensor continues to interfere, You won't touch the screen with your ear or accidentally hang up on calls.Obviously, it's not ideal if you're on the street or in a public place, because you lose privacy.
Another option is to use headphones with a microphone, either wired or Bluetooth. When carrying your phone in your pocket or resting it on a table, The position changes and often the sensor problem becomes secondary.Since the device isn't pressed against your face, it doesn't fix the root cause of the problem, but it allows you to use your phone normally until you can dedicate time to properly repairing it.
Reset your phone to factory settings
If you've tried adjustments, cleaning, cases, screen protectors, calibration apps, phone app changes, restarts, and updates, and nothing seems to work, you have one more important option before declaring the sensor dead: restore the phone to its factory settings.
With this option, the device returns to its factory settings, erasing apps, settings, files, and any conflicts that may have accumulated over time. If the problem stems from some deep software conflict, a corrupted file, or strange changes in system configurationA complete reset usually has a good chance of fixing it.
Before you begin, be sure to back up your contacts, photos, videos, documents, and any other important data. From Settings > System > Backup and Restore (or the equivalent menu in your Android device), configure the back up using your Google account or another service so as not to lose anything essential.
Next, go to Settings > System > Reset and look for the option Factory data reset or similarConfirm the process, wait for the phone to erase and restart, and set it up as if it were new. Before restoring all your apps and data, check during a call if the screen turns off correctly. If it does, you'll know the problem was with the previous software.
When is it time to go to the repair shop?
If after all of the above the sensor still does not respond, the screen does not turn off during calls, and the test apps indicate null or strange readings, the most reasonable thing to assume is that The problem is with the hardware; the proximity sensor needs repair or replacement..
In that situation you have several options: contact the You can contact the manufacturer's official technical service, go to the store where you bought the phone, or take it to a trusted service center.Ideally, you should start with the official service, especially if the device is still under warranty.
Keep in mind that the warranty usually covers factory defects, but not damage from impacts, drops, moisture, or obvious misuse. If your phone has gotten wet, been dropped heavily, or has visible cracks, it's likely that The cost of the repair will be your responsibility, whether it's just the sensor that needs replacing or the entire screen module..
Final considerations
Before authorizing any repair, get a quote and consider whether it's worth it. In many phones, the proximity sensor isn't excessively expensive, but if the repair involves replacing the screen and other components, it might be time to... Consider whether to invest in the repair or opt for a new deviceYou can also use the manufacturer's forums and support channels to check for any pending software patches before making a purchase.
When your phone's screen doesn't turn off during calls, the problem can almost always be solved by playing with settings, cleaning, cases, screen protectors, calibration via apps, restarts, updates, and even a factory reset; if, after ruling all that out, the tests still indicate anomalous readings, the most sensible thing to do is assume that the The proximity sensor is damaged; have a technician check the hardware to restore normal call functionality..