Originally Posted by: BenoitI 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.

I remember those days. A lot of my friends used the ol' dial tone. I used the intro harmonics Steve Howe of Yes played in the song round-a-bout back then.
You can buy an inexpensive tuning fork if you prefer, but chromatic tuners are easy to use, have multiple uses and are very affordable these days. That's your best bet, imo, if you want to get serious with playing.