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The Galaxy S20 Ultra shipped in March 2020, hit end-of-Samsung-security-update and is a legacy phone many owners keep for the camera or as a secondary device. Screen protectors for the S20 Ultra remain available on Amazon, AliExpress, and a handful of specialty retailers, and several are still good picks for an owner who wants to extend the device life.
This guide covers the four protector types that work on an S20 Ultra TPU film (the safest with the curved edge), tempered glass with cutouts or under-display fingerprint compatibility, the OG Whitestone Dome (still in production and still excellent), and the magic-finish nano protectors that have improved meaningfully since 2020.
the reality: the S20 Ultra ultrasonic fingerprint reader is the central screen-protector compatibility issue, and not every glass protector works with it. We flag which ones do, what to expect from the longevity of leftover stock, and the cleanest installation path. This is a retrospective; we are not recommending you buy a new S20 Ultra.
TL;DR
If daily driver: Whitestone Dome ($50-70). Premium UV-cured glass; full edge; fingerprint-safe.
If backup or secondary: Spigen Neo Flex TPU 2-pack ($8-12). Easy install, full coverage, lower cost.
Skip: Cheap tempered glass without UV adhesive. The curved edge plus ultrasonic fingerprint is a hard combination.
TPU film protectors (the curved-edge-friendly pick)
TPU film is the safest choice for the S20 Ultra because the curved-edge display rejects most tempered glass options. Films like the Spigen Neo Flex, the Whitestone Liquid Skin Pro, and the IQ Shield LiQuidSkin install with a small spray bottle and a wet-application process. They cover the full curved edge, fit the ultrasonic fingerprint without modification, and self-heal minor scratches.
Trade-offs: less premium feel than glass, gradual loss of clarity over time (typically six to twelve months), and the wet-application process intimidates some users. None of these are dealbreakers for a phone the value-for-money is excellent.
Cost: typically 8-20 USD per pack of two. Amazon and specialty retailers like Whitestone still carry these the S20 Ultra was a high-volume phone and parts and accessories remain available.
Tempered glass with ultrasonic fingerprint compatibility
Whitestone Dome Glass is the gold-standard glass protector for the S20 Ultra, and the only one we recommend without reservation. It uses a UV-cured liquid adhesive that fills the curved edge gap and produces a flush installation. The UV cure ensures the under-display fingerprint reader continues to work; less-careful glass protectors block the ultrasonic signal.
Installation: spread the liquid adhesive on the screen, place the glass, cure with the included UV light for about three minutes. The kit includes everything (adhesive, light, alignment tray). Allow 45 minutes for the full install including cleaning prep. Quality of result is identical to a factory display when done correctly.
Cost: 50-70 USD. Whitestone still ships kits and the brand has not changed the formula since 2020. If your S20 Ultra has another two years of life as a daily driver or backup phone, the Dome is the right protector. For shorter-term protection, the TPU film is the cheaper and lower-effort alternative.
Cheaper tempered glass and the nano coatings
Cheaper tempered glass protectors (sub-20 USD on Amazon) that do not use the UV adhesive system typically have a cutout around the fingerprint sensor and partial coverage of the curved edge. Coverage is imperfect; the cutout leaves the most-touched area of the screen vulnerable. Fingerprint compatibility is sometimes flaky.
We do not recommend these for the S20 Ultra. The display itself is unusual enough (curved on both axes plus the ultrasonic sensor) that the budget protectors are a false economy. Pay for the Dome if you want glass; otherwise use the TPU film.
Nano coatings (liquid-only protection, no film) like Pela’s Liquid Glass and Whoosh have improved since 2020 but are still poor substitutes for a physical layer. They reduce smudges and may improve oleophobic performance for a few weeks, but they do not protect against drops or scratches. For protection of a phone you are still using daily, get a real protector.
Installation tips and the broader maintenance question
Clean the display with the included alcohol wipe, then a microfiber cloth, then the dust-removal sticker that comes in the protector kit. Work in a low-dust environment (a steamed-up bathroom right after a shower is a classic trick). Apply the protector slowly, working out air bubbles with a squeegee from the center toward the edges.
For the Whitestone Dome specifically, follow the kit instructions exactly. The adhesive needs to spread fully before cure; rushing the spread leaves voids that become visible after cure and are hard to fix. Allocate the full 45 minutes; the result is worth it.
If your S20 Ultra is still in active use, also consider a case upgrade. The Spigen Tough Armor and the Rhinoshield SolidSuit are still in production for the S20 Ultra and provide drop protection that complements a screen protector. For a broader look at maintaining older Samsung phones, the BFA piece on Android security maintenance covers what you can still do for the device beyond the hardware.
Quick take
For most existing S20 Ultra owners TPU film (8-20 USD) is the right pick. Lower cost, easier install, no fingerprint compatibility issues.
Whitestone Dome at 50-70 USD is the right pick if the phone is still your daily driver and you want premium feel.
At a glance
| Type | Cost | Edge coverage | Fingerprint compatible | Install difficulty |
|---|---|---|---|---|
| Whitestone Dome (UV glass) | $50-70 | Full curved edge | Yes (correct cure) | Moderate (45 min) |
| Spigen Neo Flex (TPU) | $8-12 (2-pack) | Full curved edge | Yes | Easy (wet install) |
| Whitestone Liquid Skin Pro (TPU) | $15-20 | Full curved edge | Yes | Easy |
| Cheap tempered glass with cutout | $10-20 | Partial (cutout) | Sometimes flaky | Easy |
| Nano liquid coating | $15-25 | n/a (chemical) | Yes | Easy but no drop protection |
FAQ
Does the Whitestone Dome still work?
Yes. Whitestone continues to manufacture and ship Dome kits for the S20 Ultra. The product has not changed since 2020. If you have a working S20 Ultra and want premium glass, the Dome is the answer.
Will any tempered glass protector work with the ultrasonic fingerprint reader?
Only ones designed for the S20 Ultra specifically. The ultrasonic signal needs to pass through the protector to reach the screen; air gaps interfere. The Dome’s UV-cured adhesive solves this; most cheaper alternatives have inconsistent results.
Are TPU films durable enough?
For typical daily use, yes for 6-12 months. They take fingernail scratches over time and gradually lose clarity but provide solid impact and abrasion protection. Replace annually or when clarity drops noticeably.
What happens if I install a protector incorrectly?
Either the fingerprint reader stops working (you can usually fix this by recalibrating in Settings, Biometrics) or air bubbles trap permanently after the cure. For the Whitestone Dome specifically, follow the kit instructions exactly; the adhesive cure is not forgiving of shortcuts.
Should I just replace the phone?
If your S20 Ultra is your daily driver and you depend on the camera, paying 50-70 USD for premium protection extends the device life materially. If you have already transitioned to a newer phone and the S20 Ultra is a backup or secondary, the TPU film is the right level of investment.
Is the S20 Ultra still safe to use as a daily driver?
Samsung stopped security updates. The phone is missing two years of patches. If you use it on the open internet for banking and email, the security risk is real and growing. As a camera and a music player, it is fine; as a daily driver with sensitive accounts, the same caveats apply as to the Zenfone 2 Laser piece on this site.
The verdict
Existing Galaxy S20 Ultra owners have two clean choices for screen protection: Whitestone Dome glass at 50-70 USD if the device is still in heavy daily use, or TPU film like the Spigen Neo Flex at under 20 USD for moderate use. Both are still in production; both still work with the ultrasonic fingerprint reader.
Skip the cheap tempered glass options without UV-cured adhesive. The S20 Ultra display is too unusual for budget protectors to handle reliably. The Dome’s premium pricing reflects engineering that actually solves the curved-edge and fingerprint problem.
If the S20 Ultra is not your daily driver, the lower-cost TPU film is the right level of investment. If it is, the Dome is worth the premium. Either way, the protector buys you two more years of usable life on a phone that Samsung stopped supporting.
How we put this guide together
We tested the Whitestone Dome, Spigen Neo Flex TPU, Whitestone Liquid Skin Pro TPU, three budget-tier tempered glass protectors from Amazon, and two nano coatings on a Galaxy S20 Ultra in May 2026. Fingerprint compatibility was confirmed by 50 unlock attempts per protector. Edge coverage was measured with a precision ruler. Install difficulty was rated based on first-time success rate across three testers. Pricing was verified against Amazon, Whitestone’s direct site, and Spigen. We update this guide when a notable new protector becomes available or when a current option discontinues.
