Black dots on Android screens aren't usually a mystery and could be anything from a notification to a camera lens, or even a group of dead pixels.

No, you're not seeing things: Your Android device sometimes displays a small green dot in the status bar. Likely nestled next to your battery icon, it comes and goes, but never seems to stick around.

Sometimes, a tiny, mysterious white dot appears at the top of your Android phone's screen on the status bar without warning or explanation. Its actual job is simple yet maddening. It tells you that ...