Place it at the start of a lost-phone scene, after a Dun Dun Dun build-up that sets up the search, then follow it with a Vine Boom payoff the moment the phone turns up under a cushion.
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This four-second clip is the repeating ping an iPhone plays when its owner asks Find My to locate it, with a bright electronic tone that stands out in a quiet room. It feels urgent and a little tense at first, then reassuring once the phone is heard. It comes from Apple's Find My feature for locating a lost iPhone.