Loud buzzing sound on phone

Have you disconnected the previous provider from the internal lines?

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Greetings, @user_zxx8ta! I hope your week has been treating you well. Thanks so much for taking a moment out of your busy day to leave a post on our community forum. I'm sorry to hear you're having issues with your phone line, but you have definitely come to the right place for assistance.

I actually had the same thing happen at my last house. When my phone service was switched over from the phone company to Xfinity, the technician had to disconnect the original phone line to the house, so my wall jacks could connect to my modem without interference.

If you could send our team a direct message with your full name, the name listed on the account (if different), and the service address associated with your account, I'd be more than happy to look into this for you.

To send a Direct Message, please click on the “Direct Message” icon in the top-right corner of the screen, next to the bell icon, click the "New message" (pencil and paper) icon, then type or select "Xfinity Support". Type your message in the text area near the bottom of the window and press Enter to send your message and initiate a live session.

I unplugged the old phone service from my telephone box and now the phones are working. Thank you for your help.