How to Fix a Phone Screen That Stays On During Calls
When you hold your phone to your ear during a call, the screen stays on instead of turning off. This causes your cheek, ear, or face to accidentally tap buttons on the screen — muting the call, opening the keypad, ending the call, putting it on speaker, or launching random apps. You constantly pull the phone away from your face to check if you accidentally tapped something, making phone calls frustrating and unreliable. The screen is supposed to turn off automatically when the proximity sensor detects that something is close to the screen, and turn back on when you pull the phone away. When this fails, the proximity sensor is either blocked, miscalibrated, defective, or disabled by a software setting.
Check for physical obstructions
The proximity sensor is a tiny component near the top of the phone screen, usually next to the front camera or earpiece speaker:
- Screen protector: This is the most common cause. Tempered glass screen protectors and plastic film protectors can block the proximity sensor if they cover it. Some protectors have a cutout for the sensor area, but if the cutout is misaligned or if the protector does not have one, the sensor cannot function properly. Try removing the screen protector and testing a call — if the screen turns off when you bring it to your ear, the protector was blocking the sensor
- Phone case: Some cases, especially flip or wallet cases, can interfere with the proximity sensor when open during a call. The case material near the top of the screen may partially obstruct the sensor. Test with the case removed
- Dirt and debris: The sensor area accumulates dust, skin oils, and makeup over time. Clean the area around the earpiece and front camera with a microfiber cloth dampened slightly with isopropyl alcohol. Pay attention to the small area where the sensor sits — even a thin layer of grime can reduce sensor sensitivity
- On phones with under-display sensors: Newer phones with full-screen displays place the proximity sensor beneath the screen. A cracked screen, heavy screen protector, or air gap in a poorly applied protector can block the infrared signal these sensors use
Test the proximity sensor
Verify whether the sensor hardware is working:
- Android: Open the Phone dialer and type *#0*# (Samsung) or *#*#4636#*#* (other Android phones) to access the diagnostic menu. Look for a Proximity Sensor test. When you cover the sensor area with your hand, the test should show the sensor value changing (typically from a high number to 0 or from Far to Near). If the sensor does not respond, it may be defective
- Android alternative: Download a sensor testing app (like Sensor Box or Phone Tester) from the Play Store. These apps display real-time proximity sensor readings. Cover and uncover the sensor — the value should change immediately. If it stays fixed regardless of proximity, the sensor has a hardware problem
- iPhone: There is no built-in proximity sensor test on iPhone. The simplest test is to make a call and slowly bring your palm toward the top of the screen (without touching it). The screen should turn off when your palm is about 1 to 2 inches from the sensor. If nothing happens, the sensor is not functioning
Software fixes
Android
- Restart the phone: The proximity sensor driver can occasionally crash or freeze, especially after extended uptime or after a software update. A restart reinitializes the sensor driver
- Check call settings: Some Android phones have a setting to disable the proximity sensor during calls. On Samsung: open the Phone app, tap the three-dot menu, Settings, look for Turn Off Screen During Calls or similar. Make sure it is enabled
- Disable screen attention features: Samsung Screen Attention (keeps screen on when you are looking at it) and similar features on other phones can conflict with the proximity sensor during calls. Settings, Advanced Features, Motions and Gestures, turn off Keep Screen On While Viewing
- Safe Mode: A third-party app may be interfering with the proximity sensor. Boot into Safe Mode (hold power, long-press Power Off, confirm Safe Mode) and make a test call. If the screen turns off properly in Safe Mode, a third-party app is the cause. Common culprits include screen filter apps, accessibility overlay apps, and custom calling apps
iPhone
- Restart: Force restart the iPhone — press and quickly release Volume Up, press and quickly release Volume Down, then hold the Side Button until the Apple logo appears. Test a call after restart
- Update iOS: Apple occasionally patches proximity sensor behavior in iOS updates. Go to Settings, General, Software Update and install any available updates
- Reset all settings: Settings, General, Transfer or Reset iPhone, Reset, Reset All Settings. This resets all system settings to defaults without deleting data. It can fix sensor calibration or configuration issues introduced by software bugs
Calibration
- Some Android phones allow proximity sensor recalibration through the service menu or settings. On Samsung, dialing *#0*# and running the proximity sensor test can sometimes recalibrate it. On other manufacturers, check Settings, System, or the service codes for your specific phone model
- If the sensor shows readings in diagnostics but the threshold seems wrong (it only triggers when something is very close or does not trigger reliably), a calibration reset may fix the sensitivity. After a factory reset, the proximity sensor recalibrates to factory defaults during the first use
Hardware failure
- If the proximity sensor shows no response in diagnostic tests, produces fixed readings regardless of proximity, or was physically damaged (cracked screen near the sensor, water damage, or impact damage), the sensor hardware needs repair
- On most phones, the proximity sensor is a small infrared LED and photodiode pair mounted near the top of the phone. It emits infrared light and measures how much bounces back — close objects reflect more light. The sensor can fail from water damage corroding its contacts, physical impact displacing it, or the IR LED or photodiode dying
- On older phones, the proximity sensor is a separate component that can be replaced independently. On many modern phones with under-display sensors, it may be integrated into the display assembly, meaning sensor replacement requires a full display replacement
- After a screen replacement (for cracking or other damage), a malfunctioning proximity sensor is common if the replacement screen does not include the sensor or if the sensor flex cable was not reconnected properly during repair
Proximity sensor repair in Marion
If your phone screen stays on during calls and the troubleshooting above did not fix it, Marion Phone Repair can test the proximity sensor hardware, determine whether the issue is a blocked sensor, a calibration problem, or a hardware failure, and repair or replace the sensor to restore automatic screen-off during calls.