When you leave your iPhone on a table or anywhere within somebody else's eyeshot, a private message may pop up on your lock screen that could be read by anyone who sees it. But there's a way to keep others from reading your possibly sensitive text messages and emails without giving up the convenience of lock screen notifications entirely.
Two-factor authentication has been around since iOS 10. It's a handy option that adds an extra layer of security to your iPhone and makes its almost impenetrable security even stronger. This feature has remained intact in iOS 11 and iOS 12, and thanks to the straightforward nature of iOS, is relatively easy to enable.
While Apple's tech used for Face ID on the iPhone is impressive, it's debatable whether it's more convenient than Touch ID. There are also concerns that your face could be used to track shopping patterns or be seen during mass surveillance by intelligence agencies. More importantly, it could be easier for law enforcement, and even thieves, to force you to unlock your iPhone.
In the US, law enforcement officials can make you unlock your smartphone with a fingerprint, but they can't force you to input a password or PIN, which would violate your Fifth Amendment rights. To help you from ever being in a scenario where you're forced to put your finger on the Touch ID sensor, Apple has a built-in way for you to disable biometrics on your locked or unlocked iPhone in mere seconds.