Credit card change

user_22rnww Good day! Thank you for reaching out to us over our Xfinity Community Forum. You can manage your saved payment methods though your Xfinity Online account portal, or the Xfinity app. 
 
Both methods are outlined in the following online article, Manage your saved payment methods.

If you need to update your Xfinity Mobile account, the steps are outlined here: How do I update my Xfinity Mobile payment information?