ʌntˈɪl ðˈɛn, dᵻspˈaɪt ðə pɹˈɛzəns ʌv lˈænsɪŋ ænd ðə tɹˈaɪsˈɪɾiz, fˈaɪvhˈʌndɹɪd sˈɛvəntˌiːn hɐdbɪn ðɪ ˈoʊnli wˈʌn ʌv mˈɪʃɪɡənz ɚɹˈɪdʒɪnəl θɹˈiː ˈɛɹiə kˈoʊdz tə hæv nˈɛvɚ bˌɪn splˈɪt, ænd wˈʌn ʌvðə fjˈuː ɹᵻmˈeɪnɪŋ ɚɹˈɪdʒɪnəl ˈɛɹiə kˈoʊdz nˌɑːt kˈaʊntɪŋ ðoʊz sˈɜːvɪŋ ɐn ɛntˈaɪɚ stˈeɪt tə hæv nˈɛvɚ bˌɪn splˈɪt ɔːɹ ˌoʊvɚlˈeɪd.
Until then, despite the presence of Lansing and the Tri-Cities, 517 had been the only one of Michigan's original three area codes to have never been split, and one of the few remaining original area codes (not counting those serving an entire state) to have never been split or overlaid.