(KSFY) - UPDATE:
Midco's phone service has been restored.
The company said its telephone service was impacted for about three hours Monday and apologized for the inconvenience.
Many Midco telephone customers are experiencing a phone issue Monday morning due to a problem with the company's phone lines.
According to Midco's official Twitter account, the company found an issue with its fiber between Sioux Falls and Yankton.
Crews are on the way to fix the problem, but Midco does not yet have a timeline on when repairs will be complete. It is still unknown how many customers have been affected.
Attempts to reach Midco by phone about the issue have been, perhaps unsurprisingly, unsuccessful.