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Phone modem

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Phone modem

Can anyone tell me what the phone modem looks like that I'm suppose to have in my home that COMCAST installed? I'm paying $7.00 a month for "something" and now I'm told I can buy a new "something (modem)" for $99.99. I did look online and the old modem, is nothing that I have in my home, a small black box, with 5 ports on the back, 1 each for telephone 1/2, ethernet, USB, cable and the power cord. My phone clicks right into the wall and power into the outlet, that's all.  I have my old Qwest modem I purchased for my computer and then the TV cable boxes from Comcast.....very confused, anybody have an anwser????