Does this work with the new samsung S23 Ultra? Many thanks

We're sorry that we haven't tested the compatibility of this ring with the Samsung Galaxy S23 Ultra at this time. After testing you can see the latest information on the product page. https://www.amazon.co.uk/gp/product/B09BZ17JM7 (Around late April, we will test the compatibility of this product with the S23 series phones.)

Does this work well in "ESRmetal kickstand case compatible with samsung galaxy s22 ultra case, versatile patented kickstand, slim flexible back cover"

It's sticky so you can stick it to whatever you like. I stuck mine to the outside of a standard case for my Pixel 7 Pro, then I can stick it onto any magsafe compatible device, so I have a MagSafe car charger.

is this ok to use on cases with frosted back?

It's only compatible with PC or TPU case without a non-slip coating.

Does it work with a samsung galaxy s21 ultra has it only say 21 and s21 plus

I have several of these and have installed it on s20 ultra, s10 5g, s10e and a Realme 8 and an iPhone 4s obviously some of these phones you not going to be able to use the positioning template that's comes with the magsafe ring... it's just a case of positioning over the correct area for wireless Qi charging unless you're just using it for magnetically holding your phone if you phone doesn't charge wirelessly (tip of your phone's not supported just find the correct area for charging then apply the ring to a case)

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🧲 Snap, Charge, and Stay Connected—Upgrade Your Case, Upgrade Your Life!

TRIPLE MAGNETIC LOCK - Experience unmatched phone-to-accessory security with 3x stronger magnetism.
DUAL CHARGER FRIENDLY - Use with any wireless charger without sacrificing MagSafe convenience or safety.
EFFORTLESS SETUP GUIDE - Installation made foolproof with an alignment tool—no guesswork, no hassle.
SNAP ON POWER ALIGNMENT - Perfectly aligns your device for lightning-fast wireless charging every time.
UNIVERSAL COMPATIBILITY - Seamlessly upgrades iPhone 11-16 and Galaxy S22-S24 cases to MagSafe-ready.

The ESRfor MagSafe Sticker is a 2-pack magnetic metal ring designed to convert compatible PC or TPU phone cases into MagSafe-ready cases. It triples magnetic strength for secure attachment, ensures perfect alignment for faster wireless charging, and supports universal compatibility with iPhone 11 through 16 series and Galaxy S22 through S24 models. Easy to install with an alignment tool, it maintains compatibility with standard wireless chargers while unlocking the full potential of MagSafe accessories.

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TrustScore 4.5 | 7,300+ reviews

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Enclosure Material	glass fiber+ferromagnetic steel
Item Dimensions	2.24 x 2.24 x 0.04 inches
Color	Black - 2 Pack
Pattern	Solid
Mount Type	Adhesive
Grip Type	Ring Grip
Additional Features	Upgrade to MagSafe

ESR for MagSafe Sticker, MagSafe Ring Magnet, 2 Pack Magnetic Metal Ring for Phone case, Universal Wireless Charger Conversion Kit for iPhone 16/16e/15/14/13/12/11, Galaxy S24/S23/S22 and More, Black

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