Why doesn't my Comcast mailing groups show up on my iPhone like they do on my PC? My address book looks the same but has nothing for my address groups.
It depends on how you are accessing the email account on the phone. Are you using the Mail app that comes as part of iOS? If so, when you are filling in the To: Cc: or Bcc fields, it will access the Contacts app that is also part of iOS. That's not the same thing as the address book you have set up in the Comcast account in the webmail. To use the Comcast address book you either have to access the account using Safari to go to the actual website,
OR----download the Xfinity Connect Mobile app, which will also access the Comcast address book when you configure the account for that in the app. In addition, the app has a toggle that lets you use either the Comcast address book or the Contacts app on the phone.
If you want to set up groups in the iOS Contacts app, you can. IMO it's a bit of a job but it is doable-------------------