The vivo X20 Plus UD is the first phone to have a fingerprint reader under its display. But can this brand-new tech prove to be a week spot? Imagine for a second the scratches that accumulate on a phone's display after a year or two of use. Will the reader stop working? We'll hand you over to JerryRigEverything and his traditional Mohs' hardness test. The screen's glass handles as expected, with light scratches at level 6 and deeper ones at level 7. And the reader lived! This isn't the first fingerprint reader to undergo the scratch test, but as the video explains this is an optical...
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