Does Best Buy carry modems that facilitate cable Internet and phone for comcast/infinity services

I believe they do.

Yes, they do. You could get a Netgear for instance. Normally the box says what provoders they are compatible with.

Yes i get my moden ther and i have my service w comcast

Yes

Yeah we do, that's actually my department in the store. My name is Conor and if you come in and ask for me on Monday the 26th from 4-9pm I will be able to help you find what you need.

Yes u need a docsis