Root About phone: delete phone #/personal info before donation

[DealerMan]

My trusty & bulletproof Admire running OA 2.3.20 / CM 5.0.2.8 is being put out to pasture. I performed a wipe data/factory reset from CM, no problems. However, when I look into About Phone/Status, it shows my phone number and a MPCS user name (phone# @aaak.mymetropcs.com). I'm still using the phone number.

Is there a way to clear this, or do I have to go back to stock/unroot?

Thanks in advance for any help (and any suggestions on how to find a good home for it).