Comcast digital phone or cable internet?

Could you tell me that if you had Comcast digital phone service or its hi-speed internet service via cable? I have both service now. I rent a cable modem for internet service but I don't think I have a "大白盒子,电话modem". I'm a bit worried if I encount the same issue when I move out my apartment eventually. So could you clarify which service you had with Comcast?

Thanks.