Home > Locations > Amarillo, TX Amarillo, TX Location Information 1800 S. Coulter Street Amarillo, TX 79106 Get directions Phone: 806-350-2445 Fax: 806-350-2448 Normal Business Hours Monday - Friday 8:30am-5pm 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.