We are all aware that after being dropped or water damaged, iPhone X and subsequent models are susceptible to Face ID failure. However, it should be noted that incorrect operation during routine maintenance might potentially cause damage to Face ID-related components, which would then lead to Face ID failure.
Restarting your iPhone or iPad is a simple repair for a minor software bug that might be the reason why Face ID is not available. Press and hold the side button and either volume button on an iPhone at the same time until the “slide to power off” slider displays on the display.
To turn off your iPhone X or newer, swipe the circular, white, and red power symbol from left to right. To restart your iPhone, hold down the side button until the Apple logo displays on the display.
On iPads, hold down the power button while pressing and holding “slide to power off.” To switch off your iPad, slide the white and red power symbol from left to right, just like you would on an iPhone. To turn your iPad back on after a little delay, tap and hold the power button once again.
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