[gobdovan]

When on Speaker/hands-free mode, it just closes screen. They assume you wouldn't press lock button while against your ear, because it closes the screen automatically. The problem is that there's some bugs that keep the screen open sometimes, or you may use it in a quiet room as if it were on hands-free.

[odyssey7]

I appreciate this reply. Even as a technical reader, these concepts are somewhat tricky to follow. In my opinion, this is more of a foot-gun than a feature. A user cannot know whether the screen is closed or not while it is next to their ear—and it’s possible that related inconsistent detection isssues sometimes automatically close the screen when the phone is not against the ear.