That Cingular rep was incorrect. You can call any number in your contact's list. You can either do it by saying it all together such as "Call Joe Smith Home" or "Call Joe Smith Mobile."
Or, you can just say "Call Joe Smith." If there are multiple numbers, it will then ask you to say which one you would like to call. So you could then say "Mobile" and it will call Joe Smith's mobile.
I love Cingular reps sometimes....
