No, 2400 baud - phase shifting is used encode the bits, so the actual frequencies used are complex. 300 baud used two tones for Tx and two tones for Rx so it is easy to whistle (albeit the characters coming out are garbage). Higher baud rates are probably impossible to whistle because the encoding is much more complex. I never tried, acoustic couplers didn't work above 300 baud. ;-)

Ref: http://en.wikipedia.org/wiki/Modem#1200_and_2400_bps

I am pretty sure he meant 2600Hz anyway

Besides everyone knows, nobody whistles 2600Hz, they just get the toy out of the Cap'n Crunch box to do it for them.

http://en.wikipedia.org/wiki/John_Draper#Phreaking

Or rehabilitate an old payphone with an in-house PBX, and then phreak it with a modded Radio Shack tone dialer. http://www.citizenengineer.com/

Well, no. It was a joke, so it was 2600 baud, not Hz.

Yes, there were a chain of people who didn't get the joke, I was just pointing out that 2400Hz wasn't a thing either, though now I see it was a thing, maybe still is, thanks Wikipedia[]

: http://en.wikipedia.org/wiki/Blue_box