You lift your iPhone to your ear, start chatting, and suddenly the screen goes black. That part is normal. The annoying bit is when it stays black, won’t wake up, and you end up pressing random parts of the glass like you’re trying to crack a safe.
In most cases, this is the iPhone proximity sensor doing its job, or getting confused by something simple like a grubby earpiece mesh, a thick screen protector, or a slightly wonky case. A few quick checks usually sort it.
If it doesn’t, it can point to a hardware problem after a drop, a previous repair, or liquid damage. I’ll run through the fast checks first, then when it’s time to book it in.
What the iPhone proximity sensor does (and why the screen goes dark)
The proximity sensor sits up at the top of the phone, near the earpiece and front camera area. Think of it like the automatic lights in a corridor: when something gets close (your face, your hand, sometimes your jumper), the iPhone turns the display off to stop cheek-dials.
So, a black screen during a call is expected when the phone’s at your ear. The problem is when:
- the screen won’t come back on when you pull the phone away
- the screen goes black even on speakerphone
- the call controls are basically unreachable until the other person hangs up
Apple bundles proximity sensor checks into their official troubleshooting sections (you’ll see it listed under sensor faults in their manuals), for example in Apple’s iPhone 15 repair manual troubleshooting contents. That’s a good reminder that this “simple” issue can be either a quick clean or a proper parts job, depending on the cause.
Proximity sensor quick checks (before you pay for a repair)
Before you assume the phone’s broken, try these. I’ve seen loads of “dead sensor” phones that just needed a clean and a better-fitting screen protector.
- Clean the top edge properly
Use a microfibre cloth and a tiny bit of screen-safe cleaner. Focus on the earpiece mesh and the very top of the glass. Pocket fluff builds up there more than people think. - Remove the case and screen protector for one test call
Thick protectors, privacy protectors, and cases with a raised lip can block the sensor. If you’re trying to fix cracked iPhone screen problems with a temporary protector, it can make this worse. - Make a test call and watch the behaviour
Call voicemail or a friend. Put the phone to your ear, then pull it away. The screen should wake quickly. If it doesn’t, wave your hand near the top edge. If it only wakes when you tap the side button, the sensor may be sticking “on”. - Restart the iPhone
Sounds basic, but it clears small iOS glitches and resets the call UI. - Update iOS (when you can)
If you’ve been putting updates off, do it. Bugs do happen, and updates often include fixes for odd call screen behaviour. - Reset all settings (last software step)
This doesn’t wipe your photos, but it will reset things like Wi-Fi and preferences. If you’re unsure, Apple’s manuals also reference running quick checks and diagnostics, like in Apple’s iPhone 12 Pro repair manual troubleshooting sections.
A quick real-world example: last week I had a customer from Essex whose phone screen went black on every call. They’d fitted a bargain privacy protector that sat slightly too high and covered the sensor area. Protector off, quick test call, problem gone.
When the black screen during calls needs a repair
If the quick checks don’t change anything, it’s usually one of these workshop-level faults.
1) Misalignment after a previous screen job
The proximity sensor relies on precise positioning and clean “windows” through the top of the display assembly. A poor-quality fit, trapped dust, or a slightly shifted bracket can cause the sensor to read “near” all the time. This is one reason I’m picky about parts and fitting on any iPhone screen replacement.
2) Damage after a drop or twist
Even if the glass looks fine, the top flex cables and connectors can take a knock. If you’re also seeing Face ID/front camera issues, it strengthens the case that something up top has been disturbed.
3) Liquid exposure and corrosion
Steam, rain, a sink splash, or the classic “dropped it in the loo” can creep into the earpiece area. If the sensor or connector corrodes, it gets unreliable. That falls under water damaged phone repair UK work, where we diagnose first before swapping parts.
4) The screen is physically damaged
If you’ve got dead spots, flicker, or a cracked top edge, you might be asking: is it worth repairing a cracked iPhone screen? In a lot of cases, yes, especially if the phone is otherwise solid and the cost of repair is a fraction of a replacement handset.
And it’s not always just the screen. People often come in with a “call screen” problem, then we also find the battery is tired (hello, iPhone battery replacement) or there’s a separate issue like broken charging port repair or phone not charging repair after lint has compacted inside the port.
Repair options in Essex and across the UK (including post-in service)
If you’re local, we handle iPhone repair Essex jobs every day, including iPhone screen repair Essex, phone screen repair Essex, and wider mobile phone repairs Essex. If you’re not nearby, we also offer a postal phone repair UK option, sometimes searched as phone repair by post UK, which is ideal if you can’t get to a shop.
You book online at Repair My Crack, package the device securely, add your order number, and include any passcodes we need for testing (only what’s necessary, and you can change it afterwards). We aim to start work as soon as it arrives, often the same day depending on the fault and parts.
A few more things people ask about a lot:
- Warranty and peace of mind: look for phone repair with warranty UK. Some places advertise lifetime warranty phone repairs, but always read the terms. We provide a clear warranty on repairs and parts, so you know where you stand.
- Pricing: if you’re searching affordable phone repairs UK, get an upfront quote and compare like-for-like parts quality.
- If you use Samsung too: we’re not just iPhone repairs. We do Samsung Phone repair and Samsung Repairs, including Samsung phone repair Essex and Samsung screen repair Essex (and yes, we’re happy to quote Samsung screen replacement cost UK as well).
We also support teams and sole traders who can’t afford downtime: business mobile phone repairs UK. business laptop and tablet repairs. trusted phone repair service UK.
If you’re googling “Repair My Crack phone repair” or even “Repair My Crack reviews. best phone repair shop in Essex”, have a look at the feedback and decide if we’re the right fit.
Quick FAQ
how long does phone screen repair take UK
Most screen jobs can be done the same day once the device and parts are in hand, but it depends on the model and any extra damage found during testing.
iPhone screen replacement cost UK
It varies by model and whether it’s OLED, LCD, or needs additional parts. We’ll quote after checking the exact device and fault, especially if the proximity area has been affected.
Samsung screen replacement cost UK
Same story, it depends heavily on model and display type. We’ll confirm the cost once we’ve identified the exact handset.
alternatives to Apple Store screen repair UK
Independent repair centres can be a solid option for speed and price, as long as they use quality parts, test properly, and offer a written warranty.
If your iPhone proximity sensor is making calls a pain, start with the quick checks (clean, remove obstructions, restart). If it still misbehaves, it’s usually a fitting or hardware issue that needs proper testing. If you’re stuck, book online at Repair My Crack and post it in, we’ll get you sorted as quickly as we can.
– James Waterston, Device Repair Specialist at Repair My Crack