КодСтранаРегионГородОператорДобавлено
+1 231 СШАMI W Michigan: Northwestern portion of lower Peninsu2013-08-22
+1 231 СШАMuskegon, MI2013-10-18
+1 231 392СШАGrand TraverseTraverse City, MISprint Spectrum L.p, Landline2013-10-18