This overlooked iPhone setting is alarming people. Here's what security experts want you to do.

"Having this on when you don’t need it is a bigger issue than not having it on," a cybersecurity expert said about the phone feature mentioned in several viral TikTok posts.

My iPhone Face ID wasn't recognizing me consistently — this one setting fixed it

Your iPhone will display a circular frame on the screen with instructions to position your face within it. It's just like ...