Are services available at midco locations? Services may not be available in all areas, and some restrictions apply. Voicemail is available in all locations where Midco provides home phone service. Visit Midco.com/Shop to check serviceability, or contact us at Midco.com/Contact. Price does not include taxes and fees.What is the postal code for bismarck? Updated a minute ago: The latest reports from users having issues in Bismarck come from postal codes 58503.What does midmidco do? Midco (also known as Midcontinent Communications) is a regional cable provider, providing a triple play service of cable television, Internet and telephone service for both North Dakota and South Dakota, along with much of Minnesota, and several communities in Kansas and Wisconsin.How does midcos robocalls work? With Midco's phone package, you get unlimited local and domestic long distance. Midco uses caller ID technology to help you identify potential spam callers – including robocalls and inappropriately spoofed numbers. How does Midco identify a call as spam?