199 Plain St, Lowell, MA 01852, United States.+1 800-266-2278Monday to Saturday from 11:00 a.m. to 4:00 p.m.Comcast Customer Service Center provides round-the-clock online and offline support to customers for communication devices. Below are the complete contact details for the Comcast service center in Chelmsford, MA, including the phone number, address, and operating hours. The store offers comprehensive technical support for products such as Xfinity TV, Mobile, Wi-Fi, Routers, Home Phone, and security equipment, ensuring unmatched service quality.