my ppc-6700 has the wrong number programmed

[neko988]

i have been tryin to figure this out for awhile now, and i have searched this forum for the answer, but ever since i got my phone from sprint its had the wrong number programmed in it. the 1st time i tried callin my voice mail is was setup to call a number 1 off from what my number is. this i fixed without problem, my problem now is that when i send mms messages it shows up as from the wrong number, when i go to settings, phone options, it shows the wrong number on the top line, with my correct number in the voice mail area. anyone know how to change this without a call to sprint and a 30 min wait on hold.......thanks in advance