The information that our representative gave you is correct. As of right now, you can only set up call forwarding (or any other feature aside from voicemail) from home. However, we are currently working on some improvements to the Digital Voice Center which will give you control of this feature from anywhere you have internet access, which should be available in the near future.
Thanks for the question!
The postings that are shown for remote ability to forward phone messages are from 2006. Has anything been done by Comcast to allow us to remotely put call forwarding to our cell phone. We have a home office, and did not put call forwarding on when we left. It would be most helpful to be able to do this remotely. Hopefully there has been some progress since 2006...