Amazon patents record to clear your phone regulating a figure of your ear. See some-more information about this thought and associated technological aspects in a following video:
According to a obvious description:
An electronic device can try to constraint during slightest one picture including during slightest a apportionment of a user’s ear when a user utilizes a electronic device for certain purposes, such as to accept a call or listen to an audio file. In some embodiments, a device analyzes a prisoner information to establish either a user is holding a device nearby a user’s right ear or left ear, and adjusts functionality of a device formed during slightest in partial on how a user is expected holding a phone. In other embodiments, a device attempts to commend a user formed on ear figure or other parameters, and can yield customized functionality of a device formed during slightest on that determination.
Link to a obvious description: USPTO