Why choose northern valley communications? Northern Valley Communications offers internet service within North Dakota and South Dakota. DSL internet from Northern Valley Communications is available to an estimated 26,000 people. In addition to DSL broadband, NVC also offers fixed wireless and fiber internet service.Does northern valley communications offer internet service in south dakota? Northern Valley Communications offers internet service within the state of South Dakota. DSL internet from Northern Valley Communications is available to an estimated 26,000 people. In addition to DSL broadband, NVC also offers fixed wireless and fiber internet service.Why is my northern valley communications speed test result low? If your Northern Valley Communications speed test result is lower than expected, try resetting your router or call Northern Valley Communications customer service for additional assistance. Oops! Something went wrong and the NDT test didn't load!How do i use the nvc service map? The NVC service map lets you see what speeds or services are available to you. Either type your address into the search bar or zoom to your location to find out more. Information is not guaranteed to be accurate.