When I have an iPhone, I feel like the ringtone is quiet !? --Why can't I hear the iPhone anymore?

Have you ever heard your phone ringtone quieter than usual? I set it to a loud volume that I could notice even in the next room, but for some reason today it's a modest volume that doesn't bother others. The battery level is good, and the low power mode doesn't seem to matter ... I'm worried about the cause.

The cause is probably "I'm looking at the iPhone screen." The iPhone that supports Face ID is equipped with a "screen gaze recognition function" that uses this function to change the volume of the ringtone.

The screen gaze recognition function is a function that recognizes the presence or absence of the line of sight using the TrueDepth camera installed in iPhone X or later. The TrueDepth camera looks at the eyes of the person holding the iPhone to determine if they are conscious of the screen. So if you're looking at your iPhone when you receive a call, you can make the ringtone louder, and if you're not looking at it, you can make it smaller.

The screen gaze recognition function is used in addition to ringtones. When it is judged that the display is not being watched, the brightness is lowered to save power, and when it is judged that the line of sight is directed to the display, the notification sound is lowered because there is no need to pay attention. It has been.

The screen gaze recognition function does not judge the owner's face. Therefore, the volume of the ringtone changes whether you are wearing a mask or someone other than yourself is holding your iPhone.

The screen gaze recognition function can be turned on / off with the "Screen gaze recognition function" switch on the "Settings" → "Face ID and passcode" screen. If you want to keep the ringtone volume constant at all times, or if you don't want to change the display brightness depending on whether you have a line of sight, turn it off.