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face id is used to open your I phone a lot faster

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it scans your face to let u in your iphone x

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The purpose of face id is to unlock something with your face

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the purpose of face id is that you can unlock the your iphone with your face

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The purpose of FaceID is to unlock your device easily, but more difficult for others

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the purpose of face ID is to scan your face  to unlock your phone with out using any button

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the purpose of the face ID is to unlock the your phone
fast

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the purpose of face id is to unlock your device without using your fingerprint

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the purpose of Face id is to unlock your phone faster and make it difficult for others to do it

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the purpose of the face id
is when is a high security which make your phone secure.for example the face id have a bio-metric which  scan your face fully and hard to unlock your phone.

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The purpose of FaceID is to unlock your phone safely and quickly. FaceID scans your face and can't be easily tricked.

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The purpose of face ID is to make it easier for you to unlock your phone but harder for random people to unlock it.

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The purpose of FaceID is to replace passwords. If you are  to have a long password and do not like to type it every time then FaceID will replace it.