Contact Columns

I've just recently started playing with Tracmor and I've run into an issue.  I would like to display the mobile phone field in the contact list.  The Show/Hide Columns drop down only includes attachments, name, title, company, email, address, and a custom field I added called notes.  Is there a way to add the mobile phone without making a custom field and using it for the phone number instead?

I wanted to do the same thing with the description field, but ended up adding the notes custom field to serve that purpose.  It would be nice if I could just display the description field too and ditch the custom field.

Thanks.
Jonathon