DBA: AT&T Illinois Carrier Type: Incumbent LEC Holding Company: AT&T, Inc. Address 1: 225 W Randolph St Address 2: City: Chicago State: IL Zip Code: 60606 Filer ID: 803214 Customer Inquiries Telephone Number: (800) 288-2020 Share this:TwitterFacebookPrintEmailLinkedInRedditTumblrPinterestPocketTelegramWhatsAppSkypeLike this:Like Loading...