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I have recently purchased an iPhone 12. I am using face Id to unlock my phone. and only 1 face id had been set up that is of me but sometime my phone will unlock with my brother's face is it a bug in ios 14.4 or it is some other issue.
iPhone 12, iOS 14
Hello jatin196,
Welcome to Apple Support Communities. It sounds like you're having trouble with your brother being able to unlock your iPhone with his face. We are happy to share information that may help.
"The probability that a random person in the population could look at your iPhone or iPad Pro and unlock it using Face ID is approximately 1 in 1,000,000 with a single enrolled appearance. As an additional protection, Face ID allows only five unsuccessful match attempts before a passcode is required. The statistical probability is different for twins and siblings that look like you and among children under the age of 13, because their distinct facial features may not have fully developed. If you're concerned about this, we recommend using a passcode to authenticate."
Check out the "Security safeguards" section of this article for more information: About Face ID advanced technology.
A step to take toward resolving this is to reset Face ID and set it up again: Go to Settings > Face ID & Passcode and tap Reset Face ID. Then tap Set up Face ID to set it up again.
Take care.
Hello jatin196,
Welcome to Apple Support Communities. It sounds like you're having trouble with your brother being able to unlock your iPhone with his face. We are happy to share information that may help.
"The probability that a random person in the population could look at your iPhone or iPad Pro and unlock it using Face ID is approximately 1 in 1,000,000 with a single enrolled appearance. As an additional protection, Face ID allows only five unsuccessful match attempts before a passcode is required. The statistical probability is different for twins and siblings that look like you and among children under the age of 13, because their distinct facial features may not have fully developed. If you're concerned about this, we recommend using a passcode to authenticate."
Check out the "Security safeguards" section of this article for more information: About Face ID advanced technology.
A step to take toward resolving this is to reset Face ID and set it up again: Go to Settings > Face ID & Passcode and tap Reset Face ID. Then tap Set up Face ID to set it up again.
Take care.
Hi melissa_m77
Thanks for your response. but I had reset my Face ID 3 times already it works for a day or so in that period of time it didn't recognize my brother's face but after that, it unlocks the phone sometimes.
For your information that my brother knows the passcode of my iPhone.
Is it like that face Id authenticate that user who knows the passcode and start recognizing that face?
Hello jatin196,
Thank you for following up.
One step to try, to ensure that Face ID is not learning your brother's face, would be to change your passcode, reset Face ID again, and not provide your brother with your passcode.
Take care.
Face ID issue
