When I traded my last phone in, I brought in the charger and was told to keep it -- that they throw power adapters away. No one wants to buy a refurb phone and have the cord suddenly fray a month later.
Does anyone know what an insurance agent makes? If I go to my local State Farm office to get a home owners policy, what is the cut that goes to the local office/agent?
https://mydeviceinfo.xfinity.com/ will walk you through finding which devices your local service + speed work with. Spoiler: most DOCSIS 3.0 modems are compatible.
Buy it, unplug your existing modem, plug the new one in, and call Comcast. I had mine out of the box and up and running in all of 15 minutes (most of that was spent on hold and waiting for the modem to reboot).