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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.

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 →

Numbers by age tier

Different age tiers need different chase strategies. Pick a tier to see this carrier's blocks in that window plus advice on what to do next.

HOT Recently issued
≤ 18 months · 0 blocks · highest chance the carrier can still help
WARM A while back
0 blocks · long shot but worth calling
COLD Several years ago
312 blocks · contact the number directly

Carrier website

Homepage screenshot of Ameritech Michigan att.com: opens in a new tab

HQ: Hoffman Estates, IL

Street view of Ameritech Michigan HQ
Street view
Satellite view of Ameritech Michigan HQ
Satellite

Block portfolio at a glance

By age

Old: 312Undated: 4,7235,035blocks
  • 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.

HawaiiAlaskaFloridaSouth CarolinaGeorgiaAlabamaNorth CarolinaTennesseeRhode IslandConnecticutMassachusettsMaineNew HampshireVermontNew YorkNew JerseyPennsylvaniaDelawareMarylandWest VirginiaKentuckyOhioMichigan (MI): 5,035 blocksWyomingMontanaIdahoWashingtonTexasCaliforniaArizonaNevadaUtahColoradoNew MexicoOregonNorth DakotaSouth DakotaNebraskaIowaMississippiIndianaIllinoisMinnesotaWisconsinMissouriArkansasOklahomaKansasLouisianaVirginiaDistrict of Columbia

Top area codes

Bars show total blocks; red overlay is recent.

248863313813734657616432269383517378989319586314810306231305906265

Block assignments by year

01
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32 04
05
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41 07
43 08
09
10
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19

Area codes

NPABlocksRecentLast
248 863 · 2017-08-18
313 813 · 2017-06-12
734 657 · 2019-10-31
616 432 · 2014-04-15
269 383 · 2013-07-08
517 378 · 2014-04-24
989 319 · 2010-08-03
586 314 · 2011-06-09
810 306 · 2006-06-28
231 305 · 2015-03-26
906 265 · 2001-05-14

States

StateBlocksRecent
MI 5,035 ·

Sister OCNs under AT&T Inc

OCNCompanyTotalRecent
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