ðə zˈiəɹoʊ twˈɛnti ˈɛɹiə kˈoʊd fˈʊli ɹᵻplˈeɪst ˈoʊldɚɹ ˈɛɹiə kˈoʊdz fɔːɹ lˈʌndən ˌɔn twˈɛnti tˈuː ˈeɪpɹəl tˈuː θˈaʊzənd, fˈɑːloʊɪŋ mˌʌltɪpəl tˈɛlᵻfˌoʊn nˈʌmbɚ tʃˈeɪndʒᵻz dˈʊɹɹɪŋ ðə nˈaɪntiːnhˈʌndɹɪd nˈaɪnti z.
The 020 area code fully replaced older area codes for London on 22 April 2000, following multiple telephone number changes during the 1990s.