Verdict: A screen that goes dark near your ear during a call can be working normally; a screen that stays black after you move the phone away needs checking. Start with a normal handset call, remove an obstructing case or removable protector, clean the front glass and restart. If the fault continues, use the manufacturer’s diagnostics or support rather than assuming a hidden calibration code will repair it.
This guide covers two call-specific symptoms: the display will not wake when you need the keypad, or it stays active and your cheek touches call controls. If the screen is black before the call starts or remains unusable afterward, follow our phone rings but its screen is black guide as well.
Check the audio route before judging the sensor
Make a short test call to someone who knows you are troubleshooting. Use the earpiece, then move the phone away from your face and observe whether the controls return. Keep fingers and hair away from the front of the phone. Record whether this happens on all calls or only in one calling app.
Samsung explicitly says its proximity behavior differs when using speakerphone or Bluetooth: the display stays available for interaction in those modes. So a screen that remains on during a speakerphone test is not, by itself, a failure. See Samsung’s proximity guidance.
| Observed Symptom | Likely Cause | Recommended Action |
|---|---|---|
| Screen dark near your ear, visible when moved away | Normal call proximity behavior | No repair is indicated by this observation alone. |
| Galaxy screen stays on with speakerphone or Bluetooth | Expected behavior for that call route | Repeat using the handset earpiece. |
| Fault began after fitting a case or protector | An accessory may interfere | Remove the case and check a removable protector, then repeat the same call. |
| Only one calling app has the problem | App behavior needs investigation | Compare with the built-in Phone app and contact the app’s support if the difference persists. |
| Screen is also unresponsive outside calls | A broader display or touch issue | Follow display troubleshooting and arrange service if it continues. |
Practical checks in a useful order
1. Check cases and screen protectors
Remove the case for one controlled test. Inspect a removable screen protector for a shifted border, dirt or damage near the phone’s upper front area. Samsung identifies accessories as possible interference; Apple also recommends removing cases and screen protectors when a screen responds incorrectly.
Do not pry at the display itself. For a factory-installed film or a foldable phone’s inner screen, follow that model’s care instructions before attempting removal. Tell support which accessory was added and whether the fault occurs with the case off. A change in behavior is useful evidence; it is not proof that the entire sensor needs replacement.
2. Clean the front surface gently
Power off the phone and disconnect cables. Clean the front glass with a soft, lint-free cloth, following the manufacturer’s directions. Samsung recommends a soft cloth around the sensor area. For iPhone, Apple permits a slightly damp lint-free cloth and warns against moisture in openings and compressed air.
Do not drip cleaning fluid into the earpiece or scrub inside its opening. Concentrated alcohol and a brush are not a documented general repair for a proximity fault. If visible contamination will not wipe away safely, let a service provider inspect it. Retest only after the surface is clean and dry.
3. Restart and compare the same call
Restart normally, then repeat the same handset-call test with the same accessories removed. Comparing several changes at once makes it difficult to tell which one mattered. If the problem disappeared, add the case back separately and test again before replacing parts.
On Galaxy phones, Samsung also lists turning off Settings > Advanced features > Motions and gestures > Double tap to turn on screen as a check for call-screen issues. Try it only if the setting exists on your model, record the previous state and restore it if it makes no difference. It is a documented troubleshooting step, not a sensor calibration.
4. Use Samsung Members for a supported hardware check
On a supported Galaxy device, open Samsung Members > Diagnostics > Phone diagnostics, then choose Proximity recognition if available. Diagnostics may appear on the Discover or Support tab. Follow the displayed instructions and save the result.
Samsung’s diagnostics documentation notes that the available tests and menus vary by model and software. A failed result is a reason to contact support. A passed test shows that the tested function responded under those conditions; it does not settle every intermittent problem in a calling app.
5. Check whether downloaded software contributes
If an Android problem began after installing an app, a manufacturer-supported safe-mode test can help. On Galaxy, open the power menu, touch and hold Power off, then select Safe mode. Samsung explains that safe mode disables most third-party apps. Use the built-in Phone app for the comparison; an unavailable third-party calling app cannot be tested in that state.
If the handset call works there, investigate recently installed apps one at a time after restarting normally. If it still fails, that result alone does not prove damaged hardware. Record the result for support. Other Android brands have different safe-mode procedures; use their instructions.
Why one sensor recipe cannot fit every phone
Proximity describes the job: deciding whether the device is near your face so the call interface behaves appropriately. It does not promise that every phone contains the same sensor in the same place. For example, Xiaomi documents a virtual proximity sensor on the Redmi 13C 5G, using software algorithms to perform that function.
That example does not establish the technology in another Redmi, Pixel, Galaxy or iPhone. Avoid diagnosing an infrared component from the symptom alone. Model-specific diagnostics are more useful than copying a calibration menu, distance reading or holding angle from a different phone. This guide does not rely on unofficial dialer codes or third-party calibration apps.
A temporary way to end an Android call
Android offers an accessibility setting named Power button ends call. If it suits your needs, find it under Settings > Accessibility, or search Settings for its name. Once enabled, pressing the power button ends a call. This is a workaround for reaching the hang-up control, not a promise to wake or repair the display. Google documents the setting here.
Test it on a nonurgent call so you know what pressing the button will do. Do not assume the same setting or behavior applies to an iPhone. If screen access is unreliable, arrange another working way to make important calls while the fault is investigated.
When to arrange service
Contact the manufacturer if the problem persists across ordinary handset calls after these checks, if its diagnostic reports a failure, or if the screen also fails outside calls. Apple’s screen guidance recommends service when its basic checks do not resolve the issue.
Give support the phone model, software version, calling app, audio route, accessory changes and any recent damage or repair. Those observations are more useful than a guess about internal wiring. For unwanted taps when you are not on a call, see our ghost-touch guide; other symptom-specific help is in the troubleshooting hub.
Research basis: official manufacturer and Android support documents checked on October 8, 2026. This is an AI-assisted research synthesis; no hands-on testing or repair results are claimed.