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Why did I think of that?
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What I typically hear when a fellow bus passenger's cell phone goes off is first a few very loud rings, and then excruciating *even louder* ring, as their bag is now unzipped and their phone now in hand, but before they actually open it and press the "connect" button.
Once the person is holding their
phone, or even rummaging in their bag for it, there's really no need for such loud alerting anymore. Hence I propose the phone have sensors for changes in ambient light level or the heat of one's hand, that determine that the bag (or pocket) is now open, and reduce the ringing volume.
Once the light/heat trigger is activated, the ringing should reduce to a quiet tone, just loud enough so the answerer can tell if there's still time to answer it.
||Better: "Electric Shock Collar Phone Ringer"
||What if you are in a dark room and turn on the light to find the phone? Now the muffled ring makes it harder to find. The general idea is good, though. Croissant from me.