No bells.
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I don't mean "How is it ringing if it's not plugged in?"
What I mean is "The bells are gone! Yet it's ringing"
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A phone like that doesn't make the ringing noise using the speaker in the handset.
That type of phone 'rings' because a striker hits two physical bells that are housed inside the base.... the base is the bell piece, not the handset and it's gone! It's not there!
This cutscene deserves the "no bell piece" prize.
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It's a striking metaphor for revelation... used 100s if not 1000s of times in media and literature. The answer - [spoiler]IN HIS HEAD[/spoiler] That's where the bell IS ringing.