I've tried a few other brands including Amfilm's UV activated self-adhesive glass screen protectors for my S21 Ultra and none of them even remotely compare with this MOWEI. Obviously, this isn't just a solution, it's a short process that you need to follow carefully. That being said, if you're not in a hurry, watch the video a couple of times and most importantly, make sure you're doing it on a completely flat surface, the result will be awesome. Use the spirit level! The glue didn't get into the speaker or keys as the foam absorbers work great. Make sure the adhesive is bubble-free and fully spread to all edges and corners of the screen before using UV light. Then make sure to use the light exactly as shown in the video, namely on the edges, sides and corners. Turn the UV light on its side and angle it down and you've got a well-adhered protection that won't lift. I've had mine for a few weeks now and there are no chips or chips around the edges. After that, the tempered glass feels as smooth as the phone screen and it's amazing! My onscreen fingerprint reader works great. I didn't even have to set up my fingerprints again. I did it anyway, just to be on the safe side and no delays or multiple tries required. The phone will be unlocked on the first try every time. Contrary to other reviews, the protection is not too small for the phone. In fact, it's the perfect size to use a phone case with. I highly recommend this if you are looking for a quality screen protector for your S21 Ultra. Just be patient and watch the video a few times before putting it on.
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