Oh Google, all the mysterious ways in which you work will continue to elude us, but now we shall shed the light on one very important puzzle that's been making us scratch our heads for months, nay years. One day you say "OK Google" to your phone and it responds with a ding letting you know it's listening. A few weeks later, you try again, and there's no ding so you have to look at your display and spot that tiny animation on the bottom to figure out if it's listening to you or not. What's the difference? It's not your phone's volume level - you sometimes hear the ding even with Do Not Disturb on and then other times you don't hear it with the volume up to maximum.

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