With Comcast:
If you order internet only: a filter is placed on the line to block the TV channels. You need a provisioned eMTA to get phone sevice.
If you order phone only: the same filter is placed on the line to block the TV channels. You need a provisioned cable modem or eMTA to get internet service. The eMTA is not provisioned for internet service, only phone service.
If you order TV only: No filter is placed on the line but you still need a provisioned eMTA for phone service and/or a provisioned cable modem for internet service.
Provisioned means that the device has been configured in their system. You cannot just plug a cable modem in and get internet. All you'll be able to do is get to a webpage that lets you sign up for internet service.
If you order internet only: a filter is placed on the line to block the TV channels. You need a provisioned eMTA to get phone sevice.
If you order phone only: the same filter is placed on the line to block the TV channels. You need a provisioned cable modem or eMTA to get internet service. The eMTA is not provisioned for internet service, only phone service.
If you order TV only: No filter is placed on the line but you still need a provisioned eMTA for phone service and/or a provisioned cable modem for internet service.
Provisioned means that the device has been configured in their system. You cannot just plug a cable modem in and get internet. All you'll be able to do is get to a webpage that lets you sign up for internet service.