@rsms @SickingJ Do you know why was C first in Swedish rotary phones? (Second image is America for comparison.)pic.twitter.com/UgHE3Itydl
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Later (push button) ones used DTMF: https://en.m.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling …
(Which leads to phreaking, blue boxes, Captain Crunch, and Steve Wozniak, if you want to pull on that fascinating thread.)
I don't know anything you mentioned here except Wozniak hahaha!
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