Direct answer
For the Samsung Galaxy S25, one app/region, moisture, protector/case, charger interference and display hardware should be separated. First, remove charger/case/protector for a dry-room test.
What this covers
- Samsung Galaxy S25 (SM-S931*)
- Samsung Galaxy family; S Pen, foldable display, DeX, USB moisture and One UI features vary by exact model.
- The specific fault this record addresses: screen or touch input is not working correctly
What it does not cover
- ×The same symptom on a different Samsung product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
A screen protector or case interfering
What separates it Touch is unreliable at the edges, or a thick protector was fitted recently. Edge gestures are the first thing to suffer, and a lifted protector traps air that the digitiser reads through.
How to confirm Remove the protector and case and retest the same gestures. This is quick, free, and accounts for a lot of 'the edges stopped working'.
- 2
Moisture, grease or sweat on the glass
What separates it Touches register in the wrong place, or the screen behaves as though something is touching it. Water bridges the capacitive field and the digitiser reads it as a finger.
How to confirm Dry the screen and your hands thoroughly and retest. Phantom touches in a bathroom or in rain are usually this and nothing else.
- 3
The phone has been dropped
What separates it A dead strip, an area that does not respond, or touches landing offset — starting after an impact, with or without visible glass damage. A digitiser can separate from the display without the glass cracking.
How to confirm Map the unresponsive area by dragging a finger slowly across the whole screen. A consistent region is physical; a wandering one is not.
- 4
The phone is too hot or too cold
What separates it Touch degrades in a hot car or in a hard frost and recovers indoors. Both the display and the digitiser have an operating range.
How to confirm Bring it to room temperature and retest before concluding anything.
- 5
A software freeze rather than a touch fault
What separates it The screen is showing something and ignoring everything, including buttons. The phone has stopped responding, not stopped sensing.
How to confirm Force-restart. A phone that responds afterwards had a software freeze, which is a completely different problem from a digitiser fault.
- 6
One app rather than the whole phone
What separates it Touch fails inside a particular app and works everywhere else. An app can capture or mishandle input without the system being affected.
How to confirm Test the same gestures on the home screen and in settings. Working there exonerates the hardware entirely.
- 7
A charger injecting noise into the digitiser
What separates it Phantom touches or erratic behaviour only while charging, particularly on cheap or unearthed adapters. The digitiser is sensitive to electrical noise.
How to confirm Unplug and retest, then test on a different adapter. This is a real and frequently missed cause.
- 8
An accessibility or display setting changed
What separates it Touches need to be held longer than expected, or gestures behave differently, with no impact and no app pattern. Touch accommodations and gesture settings do exactly this.
How to confirm Review the accessibility touch settings. These get enabled accidentally and are hard to guess at.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Whether the image itself is wrong, or the image is perfect and touch is not. Display and digitiser are two different components and this question separates them.
- A map of where touch fails, made by dragging slowly across the whole screen — a consistent region means something different from scattered failures.
- Whether it fails everywhere or only inside one app.
- Whether it fails only while charging, and on which adapter.
- Whether the phone has been dropped, and whether there is any visible damage — including none.
- The temperature, and whether it recovers indoors.
- Whether a screen protector or case is fitted, and when it was fitted.
Separate the display from the digitiser
ReversibleWrong pixels, lines or dead areas in the image are a display fault. A perfect image that ignores or misplaces touches is a digitiser fault. They are two components stacked together, they fail independently, and every step below depends on knowing which one you have.
Force-restart before anything else
ReversibleA phone that has frozen shows a static image and ignores every input, which is indistinguishable from a dead touchscreen until you restart it. This is fast, safe, and it rules out the single most recoverable cause.
Remove the screen protector and case
ReversibleEdge gestures suffer first, and a lifted protector traps air that the digitiser reads through. This costs nothing and it accounts for a large share of complaints that the edges have stopped responding.
Dry the screen and your hands
ReversibleWater bridges the capacitive field and the digitiser reads it as a finger, which produces both missed touches and phantom ones. Erratic behaviour in a bathroom, in rain, or with damp hands is usually only this.
Map the failure by dragging slowly across the whole screen
ReversibleA consistently unresponsive band or region is physical damage — a digitiser can separate from the display without the glass cracking. Failures that wander are not physical, and that distinction decides whether this is a repair or a settings problem.
Test the same gestures in another app and on the home screen
ReversibleTouch failing inside one app and working elsewhere exonerates the hardware completely. An app can capture or mishandle input without any system-level fault, and no amount of hardware troubleshooting will help.
Unplug the charger and retest
ReversibleA cheap or unearthed adapter can inject enough electrical noise to produce phantom touches, and the symptom appears only while charging. This is real, frequently missed, and testing a different adapter settles it.
Review the accessibility touch settings
ReversibleTouch accommodations, hold durations and gesture settings do exactly what a failing digitiser appears to do, and they get enabled accidentally. They are impossible to guess at from the symptom, so they have to be checked deliberately.
Bring the phone to room temperature
ReversibleBoth the display and the digitiser have an operating range, and touch genuinely degrades in a hot car or a hard frost. Judging a screen while the phone is outside that range measures the temperature, not the screen.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- SM-S931*. Samsung Galaxy family; S Pen, foldable display, DeX, USB moisture and One UI features vary by exact model.
- Display
- 156.4mm (6.2" full rectangle) / 152.3mm (6.0" rounded corners), 2340 x 1080 (FHD+), Dynamic AMOLED 2X, up to 120 Hz. Samsung quotes two figures for screen size — the full rectangle and the rounded-corner measurement — which is why this phone is listed at two different sizes in different places and neither is wrong.
- Refresh rate
- Up to 120 Hz adaptive. A high refresh rate is one of the larger discretionary battery costs on this phone: it is genuinely smoother and it genuinely costs runtime, which is why battery complaints on this model are worth checking against the refresh-rate setting before anything else.
- Panel
- Dynamic AMOLED 2X. This is an AMOLED panel, so dark mode reduces consumption for real — black pixels are switched off rather than backlit — and a static bright element left on screen for very long periods is the one wear risk this panel type has.
- Rear cameras
- 50.0 MP + 10.0 MP + 12.0 MP. The main sensor is 50 megapixels, which produces substantially larger files than a 12-megapixel camera and is a meaningful contributor to how quickly storage fills.
- Zoom
- Optical Zoom 3x, Optical quality Zoom 2x (Enabled by Adaptive Pixel sensor). Zoom range is the practical difference between models in this line. A close-up that will not focus at the long end is normally the telephoto's minimum focus distance rather than a fault — taking the same shot at 1x confirms it in seconds.
- Video
- UHD 8K (7680 x 4320)@30fps. Resolution and frame rate dominate how quickly video fills storage and how hard the phone works thermally — sustained 8K recording is the single most common reason a Galaxy camera stops mid-take and warns about temperature.
- Memory and storage
- 12GB RAM with a 128GB storage tier. RAM matters directly to one symptom: apps reloading when you switch back to them is memory pressure rather than a crash, and it is more likely on the lower-RAM configurations.
- SIM
- SIM 1 + SIM 2 / SIM 1 + eSIM / Dual eSIM. Three combinations are supported, and the default line for calls, for messages and for cellular data are three separate settings — crossing them produces calls arriving on one number while data or messages use another, with almost no indication that anything is wrong.
- Wi-Fi
- 802.11a/b/g/n/ac/ax/be 2.4GHz+5GHz+6GHz, EHT320, MIMO, 4096-QAM. This is Wi-Fi 7 hardware with 6 GHz support, so it can use bands an older phone on the same network cannot — which is worth knowing before concluding the router is at fault when one device performs differently from another.
- Bluetooth
- Bluetooth v5.4. Version affects range, reconnection behaviour and which accessory features are available — a newer accessory paired here operates at this version's capabilities rather than failing, which is regularly mistaken for a pairing fault.
- Connector
- USB Type-C. Note that a USB-C cable which fits is not necessarily rated for this phone's charging speed: USB-C carries several power profiles, and a data-oriented cable charges slowly or intermittently while seating perfectly.
- Processor
- 4.47GHz, 3.5GHz octa-core. Clock speed is not the useful number for troubleshooting; what matters is that sustained heavy work throttles, so performance measured while the phone is already hot is measuring the throttling rather than the phone.
- Samsung's own specification
- Samsung publishes the full specification for this model at samsung.com/uk/smartphones/galaxy-s25/specs/. Where any figure above matters to a decision, that page is the authority and this one is not.
- Biometric
- An in-display fingerprint reader, which looks through the screen. A thick or incompatible screen protector genuinely interferes with it, which is why unlock reliability often changes the day a protector is fitted rather than gradually.
- Modem
- 5G capable. In marginal 5G coverage the phone hands repeatedly between 5G and LTE, which costs more battery and generates more heat than settling on either — so the preferred-network setting is a real diagnostic lever rather than a preference.
- Charging
- Supports wireless charging. Coil alignment is tighter than it looks and a thick case, a metal plate or a card in the case defeats it entirely — so wireless charging failing while cable charging works is usually the case rather than the phone.
- Water resistance
- Rated water resistant, which is not waterproof and which degrades with age, drops and seal disturbance. The rating covers incidental exposure; it is not a guarantee, and moisture-detection warnings are deliberately conservative and can persist after the port feels dry.
- Platform
- Android, with a manufacturer interface layer over it. Battery optimisation and background-execution restrictions are applied per app and are far more aggressive than on iOS — which is why 'set this app to unrestricted' is a real fix here and has no equivalent elsewhere.
- Symptom boundary
- This record covers Samsung Galaxy S25 when it screen or touch input is not working correctly. A different symptom on the same hardware, or this symptom on a different Samsung product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !There is a consistent dead region, an offset that does not move, or visible damage — the digitiser has failed and it is a repair.
- !The image itself is wrong: lines, discolouration, dead pixels or a spreading dark area. That is the display, and a spreading area gets worse.
- !Touch failed after liquid exposure, which frequently progresses even after the phone appears to dry out.
- !The screen is lifting at an edge, which is the battery swelling underneath it — a stop condition.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Samsung publishes this as "Touchscreen issues on a Galaxy phone or tablet". Covers unresponsive, erratic or ghost touch input on a Galaxy screen, including screen-protector and safe-mode isolation. Probed 2026-08-21: title-verified. What that article does not carry is the model boundary — it is written for a product line, and SM-S931* is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
What size is the Galaxy S25 screen?+
Samsung lists 156.4mm (6.2" full rectangle) / 152.3mm (6.0" rounded corners), at 2340 x 1080 (FHD+). The two size figures are the full rectangle and the rounded-corner measurement — both are Samsung's own numbers, which is why this phone appears at two different sizes in different places.
Does the Galaxy S25 have a 120Hz screen?+
Yes, up to 120 Hz adaptive on a Dynamic AMOLED 2X panel. It is worth knowing for battery complaints specifically: a high refresh rate is one of the larger discretionary costs on this phone, and it is the first setting to check when runtime is disappointing.
Does dark mode save battery on the Galaxy S25?+
Yes, genuinely — it uses an Dynamic AMOLED 2X panel, where black pixels are switched off rather than backlit. The saving is real though smaller than reducing brightness or refresh rate, which remain the larger levers.
What cameras does the Galaxy S25 have?+
50.0 MP + 10.0 MP + 12.0 MP, with optical zoom 3x, optical quality zoom 2x (enabled by adaptive pixel sensor).
How much storage and RAM does the Galaxy S25 have?+
12GB RAM and a 128GB storage tier. The RAM figure is the one that matters for a specific symptom: apps reloading from scratch when you switch back to them is memory pressure rather than crashing, and it is more likely on lower-RAM configurations.
Does the Galaxy S25 support eSIM?+
Yes — Samsung lists SIM 1 + SIM 2 / SIM 1 + eSIM / Dual eSIM. Because more than one line can be active, check which line is set as the default for calls, for messages and for cellular data separately; those are three settings and crossing them is easy to do and hard to notice.
What Wi-Fi does the Galaxy S25 support?+
802.11a/b/g/n/ac/ax/be 2.4GHz+5GHz+6GHz, EHT320, MIMO, 4096-QAM. That is Wi-Fi 7 with 6 GHz, so it can use bands an older phone on the same network cannot — a useful thing to know before blaming the router when two devices behave differently.
Can the Galaxy S25 record 8K video?+
Yes — UHD 8K (7680 x 4320)@30fps. Bear in mind that resolution and frame rate dominate both how fast storage fills and how hard the phone works thermally, and sustained 8K is the most common reason a Galaxy camera stops mid-recording with a temperature warning.
What Bluetooth version is the Galaxy S25?+
Bluetooth v5.4. Version affects range, reconnection and which accessory features are available — a newer accessory paired here runs at this version's capabilities rather than failing, which regularly gets misread as a pairing fault.
The screen is frozen and nothing works.+
Force-restart it first. A frozen phone shows a static image and ignores every input, which is indistinguishable from a failed touchscreen until you restart. If it responds afterwards, you had a software freeze, which is an entirely different problem from a digitiser fault.
The edges of the screen stopped responding.+
Take the case and screen protector off and retest. Edge gestures are the first thing a thick protector or a case lip interferes with, and a protector that has lifted slightly traps air the digitiser has to read through. This is free to rule out.
It registers touches in the wrong place when my hands are wet.+
Water bridges the capacitive field and the digitiser reads it as a finger. That produces both phantom touches and missed ones, and it is not a fault — dry the screen and your hands and it goes away. Wet-hand behaviour in a bathroom is this almost every time.
Part of the screen does not respond at all.+
Drag a finger slowly across the whole screen and map exactly where it fails. A consistent band or region is physical damage — and a digitiser can separate from the display in a drop without the glass cracking, so no visible damage does not rule it out.
It only misbehaves while charging.+
Try a different adapter. A cheap or unearthed charger can inject enough electrical noise into the digitiser to cause phantom touches, and the symptom appears only while plugged in. It is a real cause and an easy one to miss.
Touch is fine everywhere except in one app.+
Then the hardware is fine. An app can capture or mishandle input without any system-level fault, so the investigation belongs with that app — update it, clear its data, or reinstall it. Nothing done to the screen will change it.
The screen went strange after I dropped it.+
Establish which layer. A wrong image is the display; a perfect image that ignores touch is the digitiser. Both can fail from an impact with no visible glass damage, and both are repairs rather than configuration.
I have to press harder than I used to.+
Check the accessibility touch settings before assuming hardware. Touch accommodations and hold durations produce exactly this and are enabled accidentally more often than people expect — they are impossible to infer from the symptom.
The screen is lifting at one corner.+
That is the battery swelling underneath it, not a screen problem. Stop charging the phone, do not press the screen back down, and treat it as a stop condition regardless of how well the touchscreen otherwise works.
Does this answer apply to every Samsung model?+
No. It is scoped to SM-S931*. Samsung Galaxy family; S Pen, foldable display, DeX, USB moisture and One UI features vary by exact model.
What should I record before troubleshooting touchscreen or screen not responding?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing touchscreen, screen not responding. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Stop for lifted display, swelling, cracks, heat or liquid exposure.
Answer for the exact device and software version shown above.