The fingerprint scanner is built into the home button, protected by a
sapphire crystal coating, and uses a low radio frequency signal to map
the unique lines of its owner's index finger or thumb. It is able to
scan the dermis layer underneath the surface of the skin, avoiding
problems caused by damaged or dry fingertips. Without pressing, the
owner will be able to unlock their phone with one touch, and once inside
the device, a fingerprint will suffice as proof of identity to purchase
music, films, books and applications from Apple's stores.
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