6, assigned +379Vietnam&0000000000084000000000+84Virgin Islands, British&0000000000012840000000+1 284[8]Virgin Islands, US&0000000000013400000000+1 340[8]Wake Island&0000000000018080000000+1 808[8]Wallis and Futuna&0000000000068100000000+681Yemen&0000000000096700000000+967Zambia&0000000000026000000000+260Zanzibar&0000000000025500000000+255Zimbabwe&0000000000026300000000+263History[සංස්කරණය]CCITT, the predecessor of the ITU Telecommunication Standardization Sector (ITU-T), developed the first formal list of telephone country codes. This list was included in the 1964 CCITT Blue Book, among other international telecommunication recommendations, which would eventually become ITU-T recommendation E.164.An earlier system of country codes for European use was mentioned in the 1960 CCITT Red Book. Some of these country codes were retained in the CCITT country code assignments and remain in effect (for example, France +33, United Kingdom +44).Fo