I remember in my first years in college I didn't have a tuner, so I used the dial tone of a pay phone lol That was kinda funny standing up in front of the pay phone (inside not outside ... that would have been plain crazy lookin') with people walking by .....

I was told it was an F so I tuned it with the 6th string / 1st fret then tuned the rest by using the fifth fret.

Not sure it's an actual F tho but it was close enough :) Maybe somebody was messing with me but it got me through the year alright.