After dropping my Galaxy S24 Ultra face-down on concrete last summer, I watched a $35 tempered glass protector shatter while my actual screen walked away scratch-free. That moment sold me on testing every screen protector I could get my hands on for Samsung phones in 2026.
I’ve spent the past three months putting 8 popular protectors through real-world torture – pocket sand, key scratches, accidental face-down drops on pavement, and daily ultrasonic fingerprint sensor use. This guide covers what actually works for Galaxy S24 Ultra, S25, and S25 Ultra owners who want to preserve their screens without sacrificing touch sensitivity or fingerprint unlock.
If you’re searching for the best screen protectors for Samsung phones in 2026, you need three things working together: 9H+ hardness tempered glass, an auto-alignment installation system, and confirmed compatibility with Samsung’s in-display ultrasonic fingerprint sensor. Our team compared 8 top contenders across durability, clarity, fingerprint compatibility, and case friendliness. We found four standouts and several budget options that genuinely punch above their price.
Our Top 3 Tested Screen Protectors for Samsung Galaxy
amFilm OneTouch for Samsung…
- Auto-alignment tray
- 30-second install
- 9H+ hardness
- Camera lens protectors included
Comparing the Market’s Best Samsung Screen Protectors in 2026
| Product | Specs | Action |
|---|---|---|
| NEW’C for Samsung Galaxy S24 Ultra |
|
Check Latest Price |
 Ailun for Galaxy S24 Ultra |
|
Check Latest Price |
| amFilm OneTouch for Galaxy S24 Ultra |
|
Check Latest Price |
 NEW’C for Samsung Galaxy S25 |
|
Check Latest Price |
 Spigen GlasTR EZ FIT for Galaxy S24 Ultra |
|
Check Latest Price |
 ESR Armorite for Galaxy S25 Ultra |
|
Check Latest Price |
 TOCOL for Samsung Galaxy S24 Ultra |
|
Check Latest Price |
 Supershieldz for Samsung Galaxy S25 |
|
Check Latest Price |
1. amFilm OneTouch for Samsung Galaxy S24 Ultra – Easiest 30-Second Installation
amFilm OneTouch for Samsung Galaxy S24 Ultra Screen Protector TemperedGlass
Auto-alignment tray
9H+ tempered glass
2+2 pack with camera lens protectors
Pros
- Auto-alignment tray delivers perfect installation in 30 seconds
- Fingerprint sensor works after re-registration
- Includes camera lens protectors in the same kit
- Crystal clear with 99.9% transparency
- Survives real-world drops that would crack bare glass
Cons
- Camera lens protector may be too thick for bulky cases
- Slightly less glare reduction than factory anti-reflective glass
I tested the amFilm OneTouch on my daily driver S24 Ultra, and the auto-alignment tray is genuinely a game-changer for anyone who hates the fumbling-and-bubbles installation dance. You literally drop your phone into the plastic frame, press down on the protector, pull the dust-removal strip, and lift. Thirty seconds later you have a perfectly aligned, bubble-free application on the first try.
The 9H hardness rating held up against intentional scratches with keys and coins in my pocket, and one accidental drop onto gravel left the protector cracked but the actual screen untouched. That’s the trade-off you want – the sacrificial layer doing its job.
Touch response felt identical to bare glass, and the in-display ultrasonic fingerprint sensor worked reliably after re-registering my prints (which amFilm clearly explains in the included instructions). The included camera lens protectors are a nice bonus, though I did notice they’re slightly thicker than some ultra-slim cases can accommodate.
9H Hardness and Drop Performance
The tempered glass passed my coin-and-key scratch test without any visible marks on the viewing area. After one accidental drop from waist height onto asphalt, the protector cracked across one corner but the actual phone display stayed pristine. That’s the entire point of using a sacrificial layer.
Real-world drop tests from other users consistently report the protector absorbing damage that would have otherwise destroyed an unprotected screen. The 0.25mm ultra-thin profile doesn’t compromise durability despite the slim design.
Fingerprint Sensor Compatibility
Samsung’s ultrasonic in-display fingerprint sensor requires re-registration after any screen protector installation – this isn’t a defect, it’s how the technology works. Once I re-registered my thumbprint with slightly firmer pressure, unlock speed felt nearly identical to the bare screen experience.
Forum users on Reddit’s r/samsunggalaxy consistently report success with amFilm and ultrasonic sensors as long as they follow the re-registration steps. Don’t skip this step or you’ll think the sensor is broken when it’s actually fine.
Camera Lens Protector Trade-Off
The 2+2 pack includes matching camera lens protectors, which is excellent value for protecting the entire phone. However, the lens protectors add noticeable thickness that may cause interference with very tight-fitting cases like ultra-slim options. If you use a chunky OtterBox Defender or similar, you’ll have no issues.
2. NEW’C for Samsung Galaxy S24 Ultra – Best Budget 3-Pack Value
NEW’C for Samsung Galaxy S24 Ultra Screen Protector Tempered Glass
3-pack HD Clear
9H hardness
Ultra-thin 0.25mm
Pros
- 3-pack at budget pricing delivers excellent long-term value
- Ultra-thin 0.25mm profile maintains touch sensitivity
- 99% display clarity preserves original screen quality
- Oleophobic coating reduces fingerprint smudges
- Bubble-free installation with included alignment tools
Cons
- May cause minor polarization issues with sunglasses
- Ultra-thin design requires careful handling during application
NEW’C’s 3-pack for the Galaxy S24 Ultra has over 110,000 reviews averaging 4.5 stars, which tells you everything about long-term user satisfaction. At this price point you’re getting three high-quality tempered glass protectors, which means even if you mess up one installation or crack one in six months, you’ve got backups ready.
The 0.25mm ultra-thin profile is genuinely impressive at this price. Touch sensitivity felt identical to the bare screen during my testing, and the oleophobic coating did a respectable job keeping fingerprint smudges at bay.
Installation was straightforward with the included dust removal stickers and cleaning wipes. The 9H hardness rating handled my pocket key test without visible scratches, and one drop onto tile left a crack on the protector (which I replaced) while the actual screen stayed pristine.
Why the 3-Pack Matters
Screen protectors fail in three main ways: installation errors (dust bubbles), accidental drops, and gradual wear from months of pocket use. Having three protectors in one package means you’re covered for all three scenarios without reordering.
From our team testing, this is the best value option if you tend to replace protectors every 4-6 months anyway. The per-protector cost is significantly lower than single-pack premium options.
Ultrasonic Fingerprint Sensor Performance
The ultra-thin 0.25mm design helps maintain ultrasonic fingerprint sensor performance, though you absolutely need to re-register your fingerprints after installation. After re-registration, unlock reliability was excellent in our testing.
Forum users occasionally report needing to press slightly harder than with the bare screen, but this is true of essentially all glass protectors due to how ultrasonic sensors work through materials.
Polarization Considerations
Some polarized sunglasses may interact oddly with this protector’s glass, causing rainbow patterns at certain angles. This is a known characteristic of tempered glass and not a defect – if you frequently use your phone outdoors with sunglasses, consider a matte/anti-glare option instead.
3. Ailun Screen Protector + Camera Lens Protector for Galaxy S24 Ultra – Complete 3+3 Pack Coverage
Ailun Screen Protector + Camera Lens Protector for Galaxy S24 Ultra
3 screen + 3 camera lens protectors
0.25mm ultra clear
Case friendly
Pros
- 3+3 pack protects both screen and camera lenses
- Self-adhering installation lays down automatically
- HD clarity preserves original display quality
- Polished rounded edges prevent chipping
- Case friendly design works with most cases
Cons
- Camera lens protector may not fit all cases
- Fingerprint unlock may require re-registration
- Edge lift possible with very tight cases
If you want complete phone protection in one package, Ailun’s 3+3 pack delivers both screen and camera lens protectors at a price that undercuts buying them separately. With 51,951 reviews averaging 4.5 stars, this is one of the most trusted budget options for Galaxy S24 Ultra owners.
The self-adhering installation process genuinely works – the protector lays down smoothly without the usual wrestling match that causes dust bubbles. I had one of my cleanest installations ever with this product.
The polished rounded edges are a thoughtful touch that prevents the chipping I usually see at protector corners after a few weeks of use. Touch response was indistinguishable from bare glass in everyday use.
Complete Protection Package
The camera lens protectors are particularly valuable for S24 Ultra owners since the large camera bump is vulnerable to scratches when you set the phone down on rough tables or surfaces. Having matching protectors for both front screen and rear cameras means full device coverage.
One caveat: the camera lens protectors add thickness around the lens area, which can cause issues with cases that have very tight camera cutouts. Test fit with your case before final installation.
HD Clarity and Display Quality
Ailun advertises 100% clarity and during my testing the protector maintained the S24 Ultra’s signature vibrant display colors and brightness. There’s no noticeable haze or color shift that cheaper protectors sometimes introduce.
The oleophobic coating isn’t quite as smooth as premium options, but at this price point it’s perfectly serviceable for everyday fingerprint resistance.
Case Compatibility Considerations
The “case friendly” designation means the protector leaves a small margin around the edges to prevent case interference. This worked well with my Spigen Tough Armor and several silicone cases I tested. Very tight cases (like some ultra-slim options) may still push up at the corners.
4. NEW’C for Samsung Galaxy S25 – Reliable Protection for the Newest Galaxy
NEW’C for Samsung Galaxy S25 Screen Protector Tempered Glass Bubble Free
3-pack HD clear
9H hardness
Touch sensitive
Pros
- Specifically engineered for Galaxy S25 6.2-inch display
- Ultra-thin 0.25mm preserves touch sensitivity
- Oleophobic coating reduces fingerprints
- 3-pack value for long-term protection
- 109
- 921 reviews confirm real-world reliability
Cons
- May cause minor polarization interference with sunglasses
- Ultra-thin profile requires careful installation handling
NEW’C’s Galaxy S25 version is essentially the same proven formula as their S24 Ultra protector but precisely cut for the 6.2-inch S25 display. With 109,921 reviews averaging 4.5 stars, this is one of the most battle-tested options for S25 owners.
I installed this on my testing S25 and the fit was perfect – no overhang, no gap, no edges lifting after two weeks of pocket carry. The 9H hardness handled everyday scratches without any visible marks.
Touch response felt identical to bare glass, including edge-to-edge swipes which can be an issue with misaligned protectors. The oleophobic coating did a respectable job keeping the screen readable during heavy use.
S25-Specific Fit Engineering
The 6.2-inch S25 has slightly different dimensions and curve radius than the S24 series, which is why generic protectors often cause touch issues or edge lift. NEW’C engineered this specifically for the S25’s exact dimensions.
If you’ve used NEW’C protectors before on previous Galaxy phones, you’ll find the same installation process and same reliable performance. Brand consistency matters when you’re buying the same product line across phone upgrades.
Fingerprint Sensor Re-Registration
As with all glass protectors on Samsung phones with ultrasonic sensors, you must re-register your fingerprints after installation. I found unlock reliability was excellent once I re-registered with slightly firmer pressure than the bare screen required.
Forum consensus on r/GalaxyS24 and r/samsung confirms that re-registration is the key step most people miss when troubleshooting fingerprint issues with new protectors.
Long-Term Durability
After two weeks of daily use including pocket carry with keys and coins, the protector showed no visible scratches in the viewing area. The oleophobic coating gradually wears down after 3-4 months of heavy use, but that’s true of essentially all glass protectors.
5. Spigen GlasTR EZ FIT for Galaxy S24 Ultra – Premium Build with Auto-Alignment
Spigen GlasTR EZ FIT Tempered Glass Screen Protector for Galaxy S24 Ultra
9H+ tempered glass
EZ FIT auto-align tray
2 pack case-friendly
Pros
- EZ FIT auto-alignment tray makes installation foolproof
- 9H+ surface hardness exceeds standard 9H ratings
- 100% optical clarity preserves display quality
- Original touch experience with 0.25mm ultra-thin glass
- Case friendly design works with Spigen and most third-party cases
Cons
- Fingerprint sensor requires re-registration after application
- May not work with some thicker case designs
- Can be difficult to remove once applied
Spigen’s GlasTR EZ FIT is the premium option for Galaxy S24 Ultra owners who want the same easy installation experience as the amFilm OneTouch with Spigen’s reputation for build quality. The EZ FIT tray is genuinely the best installation system I’ve used – the plastic frame snaps onto your phone and you just drop the protector in.
The 9H+ hardness rating (Spigen claims 10H, technically) held up excellently in scratch tests, and the 100% optical clarity means there’s zero haze or color shift compared to bare glass.
Touch response was identical to the bare screen, which is what you want from a premium protector. The oleophobic coating felt noticeably smoother than budget options during my testing.
EZ FIT Tray Installation System
The plastic alignment tray is the standout feature. You literally snap it onto your phone, peel the backing, drop the protector in place, press down, and remove the tray. First-try success rate is nearly 100% based on user reports across forums.
This is a massive upgrade from the old hinge-style alignment frames that some protectors still use. If you’ve ever botched a screen protector installation, the EZ FIT system will change your mind about applying protectors at home.
Fingerprint Sensor Behavior
Like all glass protectors, the ultrasonic fingerprint sensor requires re-registration. After re-registering with slightly firmer pressure than the bare screen, unlock reliability was excellent in our testing.
Some forum users report needing to press slightly harder than with bare glass even after re-registration, but this is a minor adjustment and not a deal-breaker for most users.
Premium Build Quality Justification
At nearly 3x the price of budget options, the question is whether the EZ FIT tray and slightly better glass quality justify the premium. If you’ve struggled with installations in the past, the answer is yes. If you’re confident in your installation skills, the budget options deliver 90% of the experience at a third of the price.
6. ESR Armorite for Samsung Galaxy S25 Ultra – Heavy-Duty Impact Protection
ESR 3 Pack for Samsung Galaxy S25 Ultra Screen Protector, Armorite
6X impact absorption
9H+ Armorite glass
UltraFit one-pull installation
Pros
- 6X impact absorption rated for drops up to 110 lb
- UltraFit one-pull installation completes in seconds
- 9H+ Armorite tempered glass exceeds standard ratings
- Full-coverage protection extends to phone edges
- Includes 12-month protection plan and lifetime support
Cons
- Loses Galaxy's natural anti-reflective coating
- Fingerprints and smudges show more than expected
- Small gap can form at edges where dust gathers
ESR’s Armorite screen protector is engineered for impact protection specifically, claiming 6X impact absorption and resistance up to 110 lb of force. For Galaxy S25 Ultra owners who work in rough environments or are particularly worried about drops, this is the heavy-duty option worth considering.
The UltraFit installation tray is one of the fastest systems I’ve tested – one-pull application genuinely takes less than 30 seconds with zero bubbles. ESR has clearly studied the auto-alignment concept and refined it.
Touch response was smooth and the fingerprint sensor worked reliably after re-registration. I did notice slightly more smudge visibility than other protectors, which is the trade-off for the heavy-duty glass formula.
Impact Protection Engineering
The Armorite glass formula is specifically designed for impact absorption rather than just scratch resistance. ESR’s marketing claims 6X impact absorption compared to standard tempered glass, though I can’t independently verify the exact multiplier.
What I can confirm is that this protector feels noticeably stiffer and more substantial than budget options. If you work construction, do outdoor photography, or simply have butterfingers, the extra protection is worth the price premium.
S25 Ultra-Specific Fit
The S25 Ultra has a slightly larger 6.9-inch display than the standard S25, and ESR engineered this protector specifically for the Ultra’s dimensions and curve radius. Generic protectors often cause edge issues on the Ultra model.
Full-coverage protection extends to the edges of the display, which is important for the curved screen design but can create a small gap at the perimeter where dust occasionally gathers.
Anti-Reflective Coating Trade-Off
One genuine downside is that this protector loses the Galaxy S25 Ultra’s excellent anti-reflective factory coating. Outdoors in bright sunlight, you’ll notice more glare than with the bare screen or some other protectors.
If outdoor visibility is critical for your use case, consider a matte anti-glare protector instead. For most indoor and moderate outdoor use, the glare difference is acceptable.
7. TOCOL for Samsung Galaxy S24 Ultra – Military-Grade Durability
TOCOL for Samsung Galaxy S24 Ultra Screen Protector
8FT military-grade drop
9H+ triple ion-exchange
2-pack
Pros
- 8FT military-grade drop protection rating
- Triple ion-exchange technology for enhanced hardness
- Revolutionary easy install with dust removal
- 99.99% light transmittance for HD clarity
- Includes 365-day warranty with responsive support
Cons
- Fingerprint sensor requires re-registration
- Can crack or chip more easily than expected
- Polarization issues with sunglasses reported by some
TOCOL markets their S24 Ultra protector with military-grade drop protection tested to 8 feet, which is impressive marketing if the real-world performance matches. With 35,696 reviews averaging 4.3 stars, this is a popular mid-range option for users who want extra durability claims.
The auto-installation system uses a similar alignment tray approach to other top options. The triple ion-exchange technology is supposed to create a harder glass than standard tempering processes.
In my testing, the installation was clean and the touch response felt natural. The oleophobic coating felt slightly less smooth than premium options but still functional for everyday use.
Military-Grade Drop Claims
TOCOL claims their protector withstands 8-foot drops and 16,000 scratches based on internal testing. While I can’t verify these exact numbers, the protector is noticeably thicker than budget options, which generally correlates with better impact absorption.
Forum users occasionally report cracking or chipping with heavy use, suggesting the durability claims may be optimistic. However, the 2-pack means you have a backup if the first protector does fail.
Triple Ion-Exchange Technology
The triple ion-exchange process is supposed to create a denser glass structure than standard tempering. In theory this means better scratch resistance. In my pocket key test, the protector came through without visible scratches.
Whether this technology justifies the price premium over standard 9H glass is debatable, but the marketing claims have technical merit based on glass manufacturing principles.
Warranty and Customer Service
The 365-day warranty is a nice bonus that’s longer than most competitors. Forum users report responsive customer service when issues arise, which adds confidence to the purchase.
For the price point, this is a solid mid-range option if you want extra durability claims and don’t want to pay premium prices.
8. Supershieldz for Samsung Galaxy S25 – Best Budget 3-Pack Option
Supershieldz (3 Pack) Designed for Samsung Galaxy S25 Tempered Glass Screen Protector, Anti Scratch, Bubble Free
3-pack tempered glass
9H hardness
99.99% clarity
Pros
- 3-pack at budget pricing for excellent value
- 99.99% clarity maintains display quality
- Easy installation with QR code video instructions
- Oleophobic coating feels smooth in daily use
- Survives real-world drops protecting the actual screen
Cons
- Glass is approximately 1mm smaller than display on all sides
- Can crack or chip relatively easily during heavy use
- Dust on adhesive side renders protector unusable
Supershieldz delivers the best budget 3-pack value for Galaxy S25 owners who want backup protectors without premium pricing. With 32,576 reviews averaging 4.4 stars, this is one of the most popular budget options for the S25 specifically.
The 9H hardness held up well in my scratch testing, and the 99.99% clarity maintained the S25’s display quality without noticeable haze or color shift. The oleophobic coating felt smooth during daily use.
Installation was straightforward using the included cleaning kit and QR code video instructions. The included alcohol wipes and dust removal stickers are basic but functional.
The 3-Pack Value Proposition
At this price point for 3 protectors, the per-protector cost is among the lowest you’ll find for legitimate tempered glass quality. For users who replace protectors every few months or want backups for travel, this math is unbeatable.
The 3-pack also protects against installation errors. If you botch your first attempt (dust bubble, misalignment), you have two more chances without reordering.
Sizing Considerations
One consistent complaint from reviews is that the glass is approximately 1mm smaller than the actual display on all sides. This is actually intentional design for case compatibility – the margin prevents the case from pushing up the protector edges.
However, if you don’t use a case, the visible margin may bother you. Most users with cases don’t notice this design choice.
Real-World Drop Performance
Forum users report this protector surviving drops that would have cracked the bare screen, which is the primary purpose of any protector. The glass may crack or chip itself during heavy impact, but that’s the intended behavior.
For the price, the protection level is genuinely impressive. Just don’t expect premium glass feel or ultra-smooth oleophobic coating that wears better over time.
Buying Guide: What to Look for in a Samsung Screen Protector in 2026
After testing dozens of protectors over the past year, I’ve identified the five criteria that actually matter when choosing a screen protector for your Samsung Galaxy phone. Skip any of these and you’ll regret the purchase within weeks.
Material: Tempered Glass vs Film vs UV Glue
Tempered glass is the standard for Samsung phones in 2026 because it provides the best balance of scratch resistance, touch sensitivity, and clarity. Film protectors are cheaper and thinner but offer minimal impact protection. UV glue (LOCA) protectors like Whitestone Dome offer the best adhesion on curved screens but require more complex installation with UV curing light.
For most users, 9H or 9H+ tempered glass delivers the best experience. UV glue makes sense if you have a heavily curved screen and budget for the more complex installation process.
Ultrasonic Fingerprint Sensor Compatibility
Every modern Samsung Galaxy phone uses an ultrasonic in-display fingerprint sensor, which requires re-registration after any screen protector installation. This isn’t optional – skip the re-registration step and your fingerprint won’t work reliably.
Look for protectors specifically advertised as fingerprint sensor compatible, and follow the re-registration instructions exactly. You may need to press slightly harder than with bare glass, but reliability should be near-identical.
Installation System: Auto-Alignment Trays
Auto-alignment trays are the single biggest quality-of-life improvement in screen protector design over the past few years. Brands like amFilm, Spigen, and ESR have all developed tray systems that make first-try success nearly guaranteed.
If you’ve ever botched an installation, prioritize protectors with included alignment trays. The few extra dollars for a tray-equipped protector will save you from wasting protectors on failed installations.
Case Compatibility
Case-friendly protectors leave a small margin around the edges so case lips don’t push up the protector. This is important for users with protective cases, especially OtterBox Defender-style heavy-duty cases.
If you don’t use a case, full-coverage protectors look better and provide more display protection. If you use any case, choose case-friendly designs or test compatibility before final installation.
Model-Specific Engineering
Samsung changes screen dimensions and curve radii between phone generations. A Galaxy S24 Ultra protector will NOT fit a Galaxy S25 or S25 Ultra properly. Always verify the protector is specifically engineered for your exact phone model.
Buying the wrong model protector is one of the most common mistakes. The dimensions look similar in product photos but the actual cutouts, curves, and edge profiles differ between models.
Frequently Asked Questions
What screen protector does Samsung recommend?
Samsung doesn’t officially recommend a specific third-party screen protector brand, but Samsung’s own accessories line includes screen protectors sold through their website and stores. For third-party options, Samsung’s ultrasonic in-display fingerprint sensor works best with 9H+ tempered glass protectors from Spigen, ZAGG, amFilm, or ESR that specifically advertise fingerprint compatibility.
Are screen protectors worth it on Samsung phones?
Yes, screen protectors are worth it on Samsung phones in 2026. Even with Gorilla Glass Armor on the latest Galaxy models, screen repairs cost $200-400 depending on the model. A $7-20 tempered glass protector can prevent that single expensive repair. Beyond drop protection, protectors prevent micro-scratches from keys and pocket sand that degrade display quality over months of use.
Will a Galaxy S24 screen protector fit the Galaxy S25?
No, a Galaxy S24 screen protector will NOT fit a Galaxy S25 properly. Samsung changed the screen dimensions, curve radius, and edge profile between these generations. Even between the standard S24 and S25 (which look similar), the exact dimensions differ enough that protectors are not interchangeable. Always buy a protector specifically engineered for your exact phone model.
What is better, tempered glass or plastic screen protector?
Tempered glass is better than plastic film for most Samsung phone users in 2026. Tempered glass provides 9H+ scratch resistance, better impact absorption, smoother touch response, and clearer display quality. Plastic film is thinner and cheaper but offers minimal drop protection and wears out faster. The only advantage of plastic film is compatibility with cases that don’t work with thicker glass protectors.
How do I install a tempered glass screen protector without bubbles?
Install a tempered glass protector without bubbles by working in a steamy bathroom (humidity settles airborne dust), cleaning the screen thoroughly with the included alcohol wipe, using the dust-removal sticker to catch remaining particles, and using an alignment tray if your protector includes one. Drop the protector in place rather than sliding it, then press from the center outward to push air bubbles to the edges.
Final Verdict: Which Samsung Screen Protector Should You Buy?
For most Galaxy S24 Ultra and S25 owners in 2026, the amFilm OneTouch remains my top recommendation because the auto-alignment tray eliminates the installation anxiety that ruins most first attempts. If you want proven budget value across multiple phone models, NEW’C’s 3-packs deliver reliable protection at the lowest per-protector cost.
Galaxy S25 Ultra owners who prioritize drop protection should consider the ESR Armorite for its impact engineering, while photographers and content creators who want both screen and camera lens protection should look at the Ailun 3+3 pack. Premium buyers who want the smoothest oleophobic coating and best alignment system can justify the Spigen GlasTR EZ FIT price premium.
Whatever protector you choose, remember that re-registering your fingerprints after installation is mandatory for Samsung’s ultrasonic sensor to work properly. This single step is what separates frustrated users who blame the protector from satisfied users who enjoy reliable unlock performance for the life of the protector.