same tonal communication. its super cool how modern day phone dial pads keep the redundant dual-tone sounds, they serve no purpose besides functioning as a tribute to the first ever phone systems. try pressing the three numbers in a row (like 1 2 3) or the three numbers in a column (like 1 4 7) and listen to how one tone remains the same while another rises or falls. old phones basically used one tone for the x coordinate and one tone for the y coordinate, and by sending those two tones over, the operator computer says "first row tone, second column tone, ah, the numbers two!"

same tonal communication. its super cool how modern day phone dial pads keep the redundant dual-tone sounds, they serve no purpose besides functioning as a tribute to the first ever phone systems. try pressing the three numbers in a row (like 1 2 3) or the three numbers in a column (like 1 4 7) and listen to how one tone remains the same while another rises or falls. old phones basically used one tone for the x coordinate and one tone for the y coordinate, and by sending those two tones over, the operator computer says "first row tone, second column tone, ah, the numbers two!"

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