DBA: AT&T Michigan Carrier Type: Incumbent LEC Holding Company: AT&T, Inc. Address 1: 444 Michigan Ave Address 2: City: Detroit State: MI Zip Code: 48226 Filer ID: 803220 Customer Inquiries Telephone Number: (800) 288-2020 Share this:TwitterFacebookPrintEmailLinkedInRedditTumblrPinterestPocketTelegramWhatsAppSkypeLike this:Like Loading...