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DIAL TONE FREQUENCY: THE PHONE NOTE AS A REFERENCE FREQUENCY
In the olden days, when you were lost in Juarez in the rain and you don’t have a digital tuner with you but you had to tune your guitar, what would you do?
Why, just reach in your pocket and whip out your trusty flip phone. The dial tone frequency, even today, is the note F, at least in North America.
Before the Internet, if you didn't have a tuner, tuning fork or electronic keyboard handy, you could still tune your guitar using a pretty accurate reference frequency—any old phone. Get a dial tone, and you’ve got your reference note.