How do I program my UTStarcom PPC-6700?

[the_biorn]

I am trying to activate my phone and the directions that sprint gives doesn't work.
Press ##520471#
With the stylus, tap Edit. Select/highlight the MDN line, and at the bottom of the screen, tap Edit with the stylus. Enter the 10-digit MDN 208371xxx and at the bottom of the screen, tap OK .

After i do the ##520471# nothing happens.

they also gave me the code: ##712720# and its the same thing.