The Galaxy S20 Plus (SM-G985 / SM-G986 5G) is 161.9 x 73.7 x 7.8 mm and 186 g, with a 6.7-inch curved display, a 4,500 mAh battery and four rear sensors including a depth-sensing time-of-flight unit. It launched in early 2020.
Six years on, very few S20 Plus handsets are anyone's primary phone. They have become work phones, car phones, kids' phones, spare phones and travel phones. That is the right frame for choosing a case: you are not protecting an investment, you are keeping a useful tool alive in a role that is often harder on it than its original one.
Best structural protection: aluminium frame
The S20 Plus curves at both left and right screen edges, which puts glass at the outermost point of the phone. A metal frame delivers the highest lip above that curve for the least added width.
Aluminium also dissipates heat rather than trapping it, which matters on an ageing battery. Heat is the main accelerant of lithium-ion capacity loss, and a six-year-old cell has no headroom to spare.
Best for water and dust: sealed case with fingerprint pass-through
The phone's factory IP68 rating is a 2020 number. Seals age. If your S20 Plus has taken drops — and after six years it has — assume the rating no longer holds.
The detail worth checking on any sealed case for this phone is fingerprint pass-through. The S20 Plus uses an ultrasonic in-display reader, and a sealed case's front membrane has to be thin and acoustically transparent enough to let it work.
Best for hands-free work: belt clip kickstand
If the phone has become a jobsite or delivery device, getting it out of your pocket removes the most common way phones die.
Best for travel: detachable magnetic wallet
A detachable wallet is the sensible compromise on a phone this age — cards when you want them, and a bare back when you want to drop it on a wireless charger.
Best thin option with a covered back: magnetic metal bumper with glass
A metal frame with tempered glass panels keeps the profile slim and the original finish visible. It is a style-forward choice — the glass back is another pane that can break — but on a phone this age that may be the trade you want.
Full range in the Galaxy S20 Plus cases collection.
Screen protectors on a curved panel
Flat tempered glass cannot follow a curve. Your two workable options are narrow-cut glass that sits inside the curve (secure, but leaves the curved strip bare) or flexible film that wraps the whole panel (full coverage, scratches more easily). If your current protector keeps lifting at the sides, that is flat glass losing to geometry — switching to film fixes it permanently.
Whichever you choose, pick one rated for the ultrasonic fingerprint reader and re-register your print after fitting.
Frequently asked questions
Will a base S20 case fit the S20 Plus? No. The S20 is 151.7 x 69.1 mm — over 10 mm shorter — and has three rear openings rather than four.
Will an S20 Ultra case fit? No. The Ultra is 166.9 x 76.0 x 8.8 mm with a substantially larger camera block.
Will an S20 FE case fit? No. The FE is 159.8 x 74.5 x 8.4 mm with a flat screen rather than a curved one.
Is the S20 series still supported? It has passed its guaranteed Android and security update window. That is a reasonable argument for using it as a secondary device rather than for banking.
Can I still get the battery replaced? Independent repair shops generally still carry cells for this generation. If the phone is otherwise sound, that is usually cheaper than replacing it.
How do I confirm my model? SM-G985 or SM-G986. Check Settings > About phone > Model number, or ask via the Contact page or 978-797-0223.
The bottom line
An S20 Plus in 2026 is a working tool, not a showpiece. Protect the curved glass with a raised lip, keep heat away from the ageing battery, and pick the carry format — belt clip, wallet, sealed — that matches the job you have given it.