Your phone screen goes black during calls, and suddenly you cannot tap the keypad, mute yourself, or even hang up. It feels like the phone died mid-conversation, but usually it has not. A tiny sensor near the earpiece is doing its job a little too well, or a case, screen protector, or software glitch is tricking it. Here are 9 fixes, in the order to try them.
Read More: Can’t Hear Your Caller? 8 Fixes That Bring Sound Back
First, Is Your Phone Actually Broken?
Your screen is supposed to go black when you hold the phone to your ear. That is the proximity sensor switching the display off so your cheek cannot mute the call or dial random numbers. It is only a problem when the screen stays black after you pull the phone away, or goes black the instant you dial.
Run this 60-second test first. Call your own voicemail, hold the phone to your ear, then pull it away. If the screen lights up within a second or two, your sensor works and something else, like a case edge or a greasy screen, is confusing it. If it stays dark on a flat table, you have a genuine sensor or software fault. If it never goes black at all, the sensor may be dead.
1. Use Speakerphone as Your Escape Hatch
When you are stuck mid-call with a black screen, say “Hey Siri, turn on speakerphone” on an iPhone, or “Hey Google, turn on speakerphone” on Android. With speakerphone on, the sensor stops blanking the screen, so you can use the keypad, mute, or end the call.
This is also your keypad workaround for automated menus. If you regularly punch in account numbers during calls, switch to speakerphone or a Bluetooth headset before you dial. Headsets keep the screen awake because the phone knows it is not against your face.
2. Clean the Sensor Strip at the Top of the Screen
The proximity sensor lives in a small strip beside the earpiece, hidden behind the glass. On iPhones with a notch or Dynamic Island it sits in that black area; on Android phones it is usually just above the display. A film of skin oil, makeup, or pocket lint over that strip can fool it into thinking your ear is always there.
Wipe the whole top edge with a dry microfiber cloth, and check for a raised screen protector edge or a speck of grit along the strip. Do not spray cleaner directly on the phone. If you use a tempered glass protector, check whether its top cutout lines up with the earpiece. A protector made for a different model is a classic cause of this fault.
3. Take the Case and Protector Off for One Test Call
Thick cases, wallet cases with a front flap, and cases with a raised lip around the top edge can all press against or shadow the sensor. The fault looks random because the case only causes trouble at certain angles. Take the case off, remove the screen protector if you suspect it, and make a test call to voicemail.
Simple idea: test with the phone naked before you buy anything or reset anything. If the screen behaves with the accessories off, you have found your culprit in two minutes, and a case with a proper top cutout costs far less than a repair visit.
4. Test the Sensor Instead of Guessing
On many Android phones you can watch the sensor work in real time. Samsung owners can dial *#0*# to open the service menu, tap Sensor, and watch the reading flip as you cover and uncover the top of the phone. On other Android phones, a free sensor test app shows the same reading. A sensor that flips cleanly is healthy, and your fault is almost certainly software or an accessory.
iPhones have no built-in sensor test, so use the voicemail call from the first section instead. Cover the top of the phone with your palm during the call, then uncover it. The screen should go dark and light up in step with your hand. If it stays dark no matter what, the fault is likely hardware.
5. Restart, Then Update, in That Order
A restart clears the temporary glitch that leaves the sensor stuck in its “near” state. Restart, then make a test call before you touch any setting. If a plain restart does not help, try a force restart: on iPhones, volume up, volume down, then hold the side button; on Android, hold power for about 20 seconds.
Then check for an update: Settings, then General, then Software Update on iPhone, or Settings, then System, then Software Update on Android. Sensor drivers and call-screen bugs get patched quietly in routine updates. Install over Wi-Fi, restart again, and test before moving on.
6. Check Bluetooth and Call Audio Routing
Here is a trap the big guides rarely mention. If your phone is connected to a smartwatch, car stereo, or earbuds, the call may route its audio there while the sensor still behaves as if the phone is at your ear. The screen stays dark, you hear nothing from the handset, and it looks like a sensor failure when it is really an audio routing mix-up. Disconnect accessories one by one during a test call.
On iPhone, also check Settings, then Accessibility, then Touch, then Call Audio Routing, and change it back to Automatic if it is set to Bluetooth Headset or Speaker. On Android, look in the Phone app settings for a “proximity sensor” or “keep screen on during calls” option. iPhones offer no such toggle, so any guide telling you to “turn off the proximity sensor” on an iPhone is describing an Android setting.
7. Reset All Settings Before You Reset Everything
If the sensor tests fine and accessories are ruled out, a corrupted setting is the next suspect. On iPhone, go to Settings, then General, then Transfer or Reset iPhone, then Reset, then Reset All Settings. This restores system defaults without deleting your photos, apps, or messages, but it does wipe saved Wi-Fi passwords, so keep those handy. On Android, the equivalent is Settings, then System, then Reset Options, then Reset Wi-Fi, Mobile, and Bluetooth.
Do not jump to a factory reset yet. A full reset erases everything and takes an hour or more to restore. Back up first, and treat it as the last software step.
8. Ask About the Last Repair
Did this problem start right after a screen replacement? That timing is a diagnosis in itself. Aftermarket screens sometimes sit a fraction of a millimeter off, or the small foam gasket that channels light to the sensor gets lost during the repair. The sensor then reads “near” permanently, and no setting will fix it. Take the phone back to the shop and describe the symptom precisely: the screen stays black after the phone leaves your ear, and it started the day of the repair.
A reputable shop will reseat the screen or replace the gasket free of charge if the fault traces to their work, so keep the receipt. Under warranty, Apple and Samsung treat sensor faults found in their diagnostics as hardware repairs.
9. End the Call When Nothing Wakes the Screen
Sometimes you just need out of a call right now. Say “Hey Siri, end call” or “Hey Google, end call” and the assistant hangs up for you. If voice control is off, press and hold the side button to summon the assistant first, then give the command. You can also ask the other person to hang up, or wait for voicemail to take over.
Once you are out of the call, turn on voice control for the future. On iPhone it lives in Settings, then Accessibility, then Voice Control. On Android, the Voice Access app from the Play Store does the same job. It gives you a hands-free way out of any future black-screen call.
What each fix costs in the US:
- Cloth, sensor-cutout case, or new protector: $0 to $25
- Restart, update, settings reset, and voice-control setup: free
- Shop diagnostic: $0 to $49
- Reseat or gasket fix at the original shop: often free
- Out-of-warranty Apple or Samsung repair: $129 to $329
- AppleCare+ or carrier insurance: $29 to $99 deductible
Conclusion
A black screen during calls is usually the proximity sensor doing its job badly, not your phone dying. Start with the 60-second voicemail test, clean the sensor strip, and try one naked test call before you reset anything. Those three steps separate a $10 case problem from a real repair.
If the sensor still refuses to wake the screen after every software fix, take the phone in, especially if the fault followed a repair. Mention the sensor by name and describe the exact symptom, and you will skip the generic troubleshooting script. For related calling headaches, see Why Your Calls Sound Muffled: 9 Easy Fixes and Phone Won’t Turn On? 9 Fixes That Revive It.
