Vintage 1960's Cap'N Crunch Bo'Son Whistle Blue Phone Phreaker
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We addressed phones and routed calls via area codes, but billed based on LATA. In practice if most of your calls were either across the country or across the neighborhood it didn't matter, but in the last days of BBSes being popular due to massive weirdness in the billing models it was often cheaper to call a BBS across the country than to call a BBS in your LATA but outside the local area.
https://en.wikipedia.org/wiki/Local_access_and_transport_are...
It had its strange charm as sort of a logic puzzle.
Unfortunately the billing department didn't get the memo and he ended up with a 50k bill from AT & T. I don't miss those days, either, mate.
https://www.qikfunder.com/crowdfund/help-john-draper-captain...
Prior to this, folks (Joybubbles etc.) would just whistle the 2600hz trunk reset tone.
John Draper is/was a Phreaker aka a phone hacker. He discovered that this toy (from a Cap'n Crunch cereal box) could be used to whistle into an old phone and make free long distance phone calls. Because of that, he was given the nickname Cap'n Crunch. He is now declining in health.