I had problems so I called customer service, after 25 minutes on hold I reached a live person who walked me through the process of checking my Comcast supplied modem. It was determined that I had a faulty modem.
Went to local Comcast and picked up new combo modem router. For two days I had no Internet Service, no phone service but cable worked. Tech came out and fixed part of the problem but said he couldn't fix the modem unless I paid a $100 fee for the service. I refused and have called back on multiple occasions to resolve the problem to no avail.
I have never had worse customer service anywhere. If you have a choice in providers choose any one but COMCAST!!!!
Product or Service Mentioned: Comcast Internet Service.
Monetary Loss: $500.