Eli5: Why does the coin drop after hanging up the pay phone

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I always see in the movies that when they hang up a pay phone, you hear a coin drop. What’s the reason for this?

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Anonymous 0 Comments

Also in my country the machine would give change, if you put in 5 guilders, the machine would show how long you were calling for and then if you had a short call, it would drop down your change.

This made me feel very old for this first time in my life, what the.

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