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I'm not telling you what to do but I would reboot the modem. Good luck!
@Carloh219 wrote:
Work with rep earlier today. Now landline not working
Hello - same issue here. Found out after 2+ hrs on cell with Comcast chat that I had to fix issue on my own. Reset/re-send signal......
Check the connection on the back of the modem. Phone jack was connected into wrong port. Try that good luck. As Comcast customers we are like sailors stranded on a deserted island.