Home > Locations > Sioux Falls, SD Sioux Falls, SD Location Information 800 S. Cliff Ave Sioux Falls, SD 57104 Get directions Phone: (605) 339-4244 Fax: (605) 339-4256 ServiceAvailable onsite with appointment EvaluationAvailable onsite with appointment Normal Business Hours Monday - Friday 8:00 am to 12:00 pm 1:00 pm to 5:00 pm After-Hours (Phone Support) Mon-Fri 5:00 pm - 12 am (EST) Sat-Sun 10:00 am - 7:00 pm (EST) (800) 500-9150 Log into myNumotion app to live chat, check your order status, or pay your invoice.