said by Eagles1221:Because the "Phone" is VOIP-based and went away right after you shut their connection down.
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Not sure how Comcast does it but around here TWC uses another VLAN for the VoIP phone. I would think its quite difficult to infect their Arris modem box so I can understand a 128Kb port with no filters on it for phone.
True if the cable provider was also supplying your phone service. For 3rd party SIP-based VOIP, it goes out over IP just like the rest of your data.
If the connection gets cut and grandma croaks because her cardiac monitor couldn't phone home, there'd be a lawsuit in short order.