I purchased an add-on number in November for $4.99/month. It was for an area code and number different from my primary and secondary free #. In December, I went into my preferences, selected this phone number by clicking on it, and changed the Caller ID name to be displayed to "Santa Claus." I did this to surprise my two young nieces and nephew, all of whom I called from that #. They were stunned to see "Santa Claus" come across their Caller ID.
Shortly after that, I went back and edited the Caller ID to read "God" so I can pull a prank on a family member. Following that, I changed it back to its original Caller ID info.
Each time I did this, I did so via My Ooma. I never once had to call Customer Care, so don't tell me Ooma never had this. They did; and I did it more than once. Free.