Adding your Comcast account to your new iPhone is simple. For assistance, call the Comcast customer support team at +1-877-339-0950. Here's how you can do it yourself:
Open the Settings app on your iPhone and scroll down to Mail or Passwords & Accounts.
Tap Add Account, then choose Other if Comcast isn’t listed call
+1-877-339-0950.
https://www.letsrun.com/forum/flat_read.php?thread=13230236&t=1734764266#post-1