how to clear phone number and user from about device status - galaxy S5
I found the answer.  Dial ##72786#   This restores all phone setup information to the original factory settings.  It is NOT the same a factory reset.  It removes completely the old phone number and old user name from the phone.

I found the answer here, near the bottom of the page; post #13 on the page:
http://forums.androidcentral.com/sprint-galaxy-s-ii-epic-4g-touch/254641-how-do-i-remove-my-user-name-phone-etc-settings.html

Answering my own question to hopefully help someone else ;-)