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i found some bug in my brother phone he buy a new phone iphone 13 pro max and he have locked his phone with his face id and when he gave me a phone and it unlocked with my face how is it possible ?
[Re-Titled by Moderator]
No, it's not a bug. It's simply a statistically unlikely but still possible occurrence:
The probability that a random person in the population could look at your iPhone or iPad Pro and unlock it using Face ID is less than 1 in 1,000,000 with a single enrolled appearance whether or not you're wearing a mask. As an additional protection, Face ID allows only five unsuccessful match attempts before a passcode is required. The statistical probability is higher—and further increased if using Face ID with a mask—for twins and siblings that look like you, and among children under the age of 13, because their distinct facial features might not have fully developed. If you're concerned about this, we recommend using a passcode to authenticate. You can also use Face ID without enabling Face ID with a mask.
No, it's not a bug. It's simply a statistically unlikely but still possible occurrence:
The probability that a random person in the population could look at your iPhone or iPad Pro and unlock it using Face ID is less than 1 in 1,000,000 with a single enrolled appearance whether or not you're wearing a mask. As an additional protection, Face ID allows only five unsuccessful match attempts before a passcode is required. The statistical probability is higher—and further increased if using Face ID with a mask—for twins and siblings that look like you, and among children under the age of 13, because their distinct facial features might not have fully developed. If you're concerned about this, we recommend using a passcode to authenticate. You can also use Face ID without enabling Face ID with a mask.
I was able to unlock my brother's iPhone using Face ID. How is this possible?
