Especially the really small ones on the side.
In: 316
Essentially, the scanner takes a “photograph” of your finger print with a lot of detail (which is why you have to move your finger around a bunch before it will be accepted) and keeps it to compare to future attempts to unlock your phone. When you press your finger against the sensor after that, it looks for unique characteristics like bends and curves in specific places in what it is seeing to confirm a match to the original it has stored in order to grant access.
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