Ameritech Michigan HOT
d/b/a AT&T Michigan
Holding: AT&T Inc
2000 W Att Center Dr, Room 4G33A
Hoffman Estates, IL 60192-5005
AT&T Michigan
2001-01-15
2019-10-31
Just issued. Call the number first.
Ameritech Michigan issued these blocks within the last 18 months, so many of the numbers in them may not have been assigned to customers yet. Call any number you're interested in, and if it doesn't go to a customer you can contact Ameritech Michigan and you might be able to get it from them.
About AT&T Michigan
AT&T Michigan (The Michigan Bell Telephone Company) is a Regional Bell Operating Company (RBOC) subsidiary of AT&T Inc. that provides wireline, fiber, wireless, and fixed wireless internet services across Michigan. The carrier serves both consumer and business customers through retail and wholesale channels, operating as part of AT&T's broader national network covering over 99% of Americans.
- Parent: AT&T Inc.
- Headquarters: Hoffman Estates, IL
- Services: wireline local exchange, fiber broadband (AT&T Fiber), fixed wireless internet (AT&T Internet Air), wireless voice and data, wholesale/interexchange
Sources: AT&T Michigan Guidebook Part 1 · Michigan Public Service Commission - Interexchange and Competitive Access Providers List (April 24, 2026) · How AT&T is Investing in Michigan
Toll-free side: Related toll-free RespOrg: AT&T (code BSSB1). View on resporgs.com →
Carrier website
att.com: opens in a new tab
HQ: Hoffman Estates, IL
Block portfolio at a glance
By age
- Recent (0). Last 18 mo
- Medium (0)
- Old (312)
- Undated (4,723)
Footprint by state
Stronger blue = more blocks issued in that state. ● marks states with activity in the last 18 months.
- Michigan MI · 5,035
Top area codes
Bars show total blocks; red overlay is recent.
Block assignments by year
Sister OCNs under AT&T Inc
| OCN | Company | Total | Recent |
|---|---|---|---|
| 6534 | New Cingular Wireless PCS LLC - IL | 58,704 | 6,826 |
| 6214 | New Cingular Wireless PCS LLC - GA | 40,046 | 5,473 |
| 6010 | New Cingular Wireless PCS LLC | 38,106 | 3,019 |
| 4036 | New Cingular Wireless PCS LLC - DC | 30,944 | 4,342 |
| 9533 | Southwestern Bell Telephone Company | 26,095 | 0 |
| 9740 | Pacific Bell Telephone Company | 18,541 | 0 |
| 9417 | Bellsouth Telecommunications Inc dba Southern Bell Telephone & Telegraph | 15,734 | 0 |
| 9419 | Bellsouth Telecommunications Inc dba South Central Bell Telephone | 13,075 | 0 |
| 9329 | Ameritech Illinois | 6,645 | 0 |
| 516C | AT&T Enterprises LLC | 5,935 | 113 |
| 9321 | Ameritech Ohio | 4,377 | 0 |
| 9325 | Ameritech Indiana | 2,941 | 0 |