I've got no love for Comcast but I've never had any issues with this. Just yesterday I called about connectivity issues and they agreed to send a tech out, neve

I've got no love for Comcast but I've never had any issues with this. Just yesterday I called about connectivity issues and they agreed to send a tech out, never asked what modem I was using. Setup with my own modem was always surprisingly easy to, just read them the MAC and was all set.