On 2001May 18, Hainan unified the three area codes of 0898, 0899 and 0890 * * into 0898. Haikou adds "6" before the original fixed telephone number; Sanya adds "8" before the original fixed telephone number; Danzhou adds "2" before the original fixed telephone number. Hainan became the first province in China to unify the area code.

The numbering principle of area code: according to the principle of multi-level tandem classification, a main international interface office is set up, which is divided into several areas according to long-distance traffic and administrative divisions, and each area is set up with a tandem center, that is, a first-level switching center; Each region is divided into several provinces, and each province has another center, namely the secondary exchange center; Each province is divided into several regions, with the central city of the region as the center, that is, the third-level exchange center, and then county centers and fourth-level exchange centers are set up in counties below each region.

Extended data

The geographical environment of Haikou:

Haikou City is located in the north of Hainan Island, bordering Qiongzhou Strait in the north, and facing Hai 'an Town of Guangdong Province by 18 nautical mile. Wenchang city in the east; It borders Wenchang City and Ding 'an County in the south and Chengmai County in the west.

Haikou City starts from the old village of Dapo Town in the east and reaches Punan Village of Xixiu Town in the west, with a distance of 60.6 kilometers between the two ends; It starts from Wuchang Village, Dapo Town in the south and reaches the sea in the north, with a distance of 62.5 kilometers between the two ends. The total area of the city is 3 145.93 square kilometers, including 2,284.49 square kilometers of land area, 8610.44 square kilometers of sea area and 0/36.23 kilometers of coastline.

Baidu encyclopedia-unified area code

Baidu encyclopedia-Haikou