Red Boxing.. By.....:
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What you'll need:

a Radio Shack 33-memory pocket dialer
soldering/desoldering equipment
A 6.5536 MHz Crystal (Availavle at JDR Microdevices, Fry's Electronics
                     About $1 each.)

Ok, now this is the hard part. Crack open the dialer, and find the 3.579 MHz
crystal. (It'll be a small cylindrical metal object, about 7mm long, 3mm wide)
Desolder this. Take your 6.5536 MHz crystal and solder it into the place 
where the 3.579 MHz crystal was. (You may need to solder some longer wires
into the spot where the 3.579 was- the 6.5536 is bigger than the 3.579..)
Close your dialer. Ok, now all the modifications are done. Using the memory
in the tone dialer, program in 5 asterisks (*'s) into the p1 location. Try
dialing the p1.. Voila! Quarter tones. 
        Now for the complications.. Some operators have been figuring out
how to "get" these red box users. For example, after dialing with a 
red box, an operator may come on telling you that he/she is having technical
difficulties, and that he's going to return your money (the money you NEVER
put in, that is.) Now here is the part where the operator is depending on
your stupidity. If you are stupid, you'll get caught. Now listen: He'll 
say he's going to return your quarters, wait a few seconds, and ask you if
you got your money back. The time between he tells you and the time he
asks you if you got the money back is the crucial moment. In this time, 
if you had any sense at all, you were listening for the the operator coin 
release signal and the click of the hopper inside the phone. (If you can't
hear the latter, get yourself a miracle ear, or quit phreaking.) If you did
hear the hopper or the release signal, you're probably safe and you can say
"Yes, I got my money back".. (But still keep on your toes, he might try it 
again.) Now, if you DID NOT hear the signal or the hopper click, say "NO! I
did not get my money back!" - The guy was trying to fool you! He's hoping that,
when he asks you if you got your $$$ back (Remember, he never even TRIED to
release the money, he thinks you've got a box..), you'll say yes, and BINGO! 
You're caught with your little black box. (How could you get money back if
he never released it???? Uh-oh. You've been a bad boy!) 
(Hey, it's happened to me - those dumb operators are smarter than you 
think..)
        Now, this little strategy is not a surefire way to use your box.
All pay phones and systems differ. I suggest you hold the box a few inches
away from the mouthpiece (The box is louder than the actual quarter tones,
that's how some operators tell..) And I wouldn't put in 25 quarters in a row
to call Zimbabwe- (Even the dumbest operators know that no human can insert
quarters into a slot at the regular timing of a computer.. I.E. which series
of clicks would you suspect most? A series of regularly timed, regularly 
spaced clicks, or a random bunch of them?)
        Also, as a REAL safeguard, and as an indicator to tell you when the
operator is playing that dumb little trick, I'd put in a nickel or a dime 
first, and then put in the rest of the "money" using your red box, using the
above techinques (Irregular intervals, holding the box away, etc..)  Hey-
It's not that bad, Imagine- an hour on a 1-900 number for only a nickel..!

The techy stuff..
Tones: 1700/2200 Hz simultaneous,
Quarter: Tone on for 33ms, off for 33ms, (repeated x5)
Nickel: 66ms
Dime: 66ms on, 66ms off, 66ms on.