Hi, I have ahard line phone sevice and Just got voice can I cancel my phone sevice and use that phone number for comcast voice? thank you
You should have set up your phone service with Comcast to PORT your old number to the new CDV service. Once the porting is complete, your old service will terminate.
See the info in the following link: https://www.xfinity.com/support/phone/local-number-portability/