ɪn mˈeɪ nˈaɪntiːnhˈʌndɹɪd nˈaɪnti, ðə zˈiəɹoʊ wˈʌn kˈoʊd wʌz ɐbˈændənd ænd ðɪ ˈɛɹiə dᵻvˈaɪdᵻd bᵻtwˌiːn zˈiəɹoʊ sˈɛvənti wˈʌn wˌɪtʃ kˈʌvɚd ɛkstʃˈeɪndʒᵻz ɪnðə sˈɛntɹəl sˈɛktoːɹˌænd zˈiəɹoʊ ˈeɪɾi wˈʌn, wˌɪtʃ kˈʌvɚd ˈɔːl ˈʌðɚ sˈɛktɚz.
In May 1990, the 01 code was abandoned and the area divided between 071which covered exchanges in the Central sectorand 081, which covered all other sectors.