How are fingerprints identified when they come into contact with the phone?

Applicable products: Smartphone
Applicable system: Unrelated to OS version
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How are fingerprints identified when they come into contact with the phone?

A detailed fingerprint reading is generated when you touch the sensor with your finger to register your fingerprint. This allows your phone to identify your fingerprint, even if you have only some of your finger touching the fingerprint sensor. You will then be able to unlock your phone.

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