Frist we need to know what can a time-of-flight camera do?
Object scanning, indoor navigation, gesture recognition
Also helps with 3D imaging and improving AR experiences
Theoretically, it can better blur backgrounds in 'portrait mode'
Tof camera sensor can be used to measure distance and volume,as well as for object scanning, indoor navigation,obstacle avoidance,gesture recognition,object tracking,and reactive altimeters.In phones,ToF camera sensors will likely be used for 3D photography, AR, and in particular portrait mode.
Theoretically,ToF cameras can better blur photo backgrounds in portrait mode.
One of the first consumer smartphones to use the tech was the Huawei Honor View 20,which recently at the tail end of 2018. Since then,many more flagship smartphones have debuted with ToF sensors.