Had a similar problem. My ATT cell comes up with some other person's name on Comcast. I called ATT and my name is registered to the number. I call Comcast / Xfinity and they said they fixed it, wrong.... it is still the same name. Xfinity / Comcast will not pull an updated caller id list from the national database. I am guessing they are lazy or it is too much trouble for them to update their database. So Caller ID on Xfinity seems to be worthless.