How does a payphone know what coin you dropped in?

10 Answers

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  • 1 month ago

    You barely see those anymore running around

  • Anonymous
    5 months ago

    Conspiracy theory- theres a tiny man in there that catches it, smells and bites into it to see if its real, then pulls a lever that either says penny dime or nickel or quarter

  • Anonymous
    5 months ago

    A payphone? What's that?

    Is it some old relic like a typewriter or a record player?

  • Anonymous
    5 months ago

    Can't remember the last time I saw a payphone.

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  • 5 months ago

    it probably has sensors that are similar to an electronic scale it can feel how much weight is dropped

  • Joe
    Lv 5
    5 months ago

    Just a lucky guess.

  • 5 months ago

    All coin-operated devices are calibrated to recognize weight, diameter and thickness of a coin.

  • 5 months ago

    Size, weight, and magnetic properties. Some or all of these, depending on the mechanism.

    As an aside, ever see the old pay phones with the 3 holes on top for nickels, dimes and quarters? Back in the day when phone calls were a dime(!) we used to carry a thin slip of card paper called a "phone fooler" in our wallets. If you slipped the phone fooler down the dime hole/slot to just the right spot, you could put a penny in the nickel slot to make a call.

  • Matt
    Lv 4
    5 months ago

    A mechanism determines the size of each coin and the system calculates how much is put in based on that.

  • 5 months ago

    By the size of it.

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