well I bought my new iPhone from one month ago, and I complete all the settings requests and I put my Face ID, but I have a problem with the Face ID it opens for my sister and we’re not even twins although we’re not similar to each other please reply quickly
iPhone XS Max , gold, 256 GB
[Re-Titled by Moderator]
iPhone XS
Apple states: About Face ID advanced technology
An extract....
"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."
First, when it opens for your sister have her try it when you are in a different room. The Face ID technology has a wide field of view; if you can see the screen it can see you. If she really can open it when you are not present go to Settings/Face ID & Passcode and rescan your face.
It's very common for siblings to mimic your face and unlock your device.
Use a passcode to lock it.
Face ID opens for my sister
