learn how to pay your comcast bill anytime, on any device, with the xfinity app or the site. You can also mail a check, use quick collect, or sign up for automatic payments and paperless billing. get the most out of xfinity from comcast by signing in to your account. may 16, 2019 · learn about the different ways to pay your xfinity bill, including online, by phone, by mail, by app, by voice remote, or by kiosk. Find the payment terms and. manage your xfinity billing, make payments, and…