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231 W Michigan: Northwestern portion of lower Peninsula; Traverse City, Muskegon, Cheboygan, Alanson 46 T1 line providers 248 Michigan: Oakland County, Pontiac 51 T1 line providers 313 Michigan: Detroit and suburbs 55 T1 line providers 517 Cent. Michigan: Lansing 56 T1 line providers 586 Michigan: Macomb County 35 T1 line providers 616 W Michigan: Holland, Grand Haven, Greenville, Grand Rapids, Ionia 56 T1 line providers | 734 SE Michigan: west and south of Detroit -- Ann Arbor, Monroe 51 T1 line providers 810 E Michigan: Flint, Pontiac 56 T1 line providers 906 Upper Peninsula Michigan: Sault Ste. Marie, Escanaba, Marquette 41 T1 line providers 989 Upper central Michigan: Mt Pleasant, Saginaw 38 T1 line providers 947 Michigan: Oakland County 10 T1 line providers 269 SW Michigan: Kalamazoo, Saugatuck, Hastings, Battle Creek, Sturgis to Lake Michigan 7 T1 line providers |