Thanks for the reply.
For people looking in the future.....
If you are using the Freepbx module, then go to buttons, then
Scroll your browser all the way to the right to find 'external number' field. That is where you put the cell #
I did not realize there were more fields hidden on the right hand side of the page.
Voicemail is setup under 'extensions' on the main freepbx page.
mattmc