ðɪ ˈoʊld kˈoʊdz kəntˈɪnjuːd tə wˈɜːk ɪn pˈæɹəlˌɛl wɪð nˈuː kˈoʊdz ʌntˈɪl dʒˈænjuːˌɛɹi nˈaɪntiːnhˈʌndɹɪd sˈɛvənti, wˌɛn ðə "ˈæn: ˈɔːlfˈɪɡjɚ nˈʌmbɚz nˈaʊ" ˈædvɚtˌaɪzɪŋ kæmpˈeɪn pɹˈɑːmptᵻd kˈɔːlɚz tə jˈuːz ˈoʊnli ðə nˈuː kˈoʊdz.
The old codes continued to work in parallel with new codes until January 1970, when the "ANN: All-figure Numbers Now" advertising campaign prompted callers to use only the new codes.