【海南省】 Hainan

• Hainan was part of Guangdong Province until August of 1988.
  
• On May 18, 2001, all cities/counties in Hainan begin using
  the 898 code, and local goes to 8 digits
  old 898 area: 6xxx-xxxx
  old 899 area: 8xxx-xxxx
  old 890 area: 2xxx-xxxx
  
• On March 6, 1994, local phone numbers of Haikou (including
  QiongShan County) was changed to 7 digits. The rules are:
  3x-xxxx to 53x-xxxx;
  8x-xxxx to 58x-xxxx;
  2x-xxxx to 62x-xxxx;
  7x-xxxx to 67x-xxxx;
  5x-xxxx to 85x-xxxx;
  6x-xxxx to 86x-xxxx.
  
• Local phone numbers of Sanya and its vicinity was changed to
  7 digits on July 13, 1996. The rules are:
  (Sanya) xx-xxxx to 8xx-xxxx;
  (Tongshi, Qiongzhong) xx-xxxx to 6xx-xxxx;
  (Ledong) xx-xxxx to 5xx-xxxx;
  (Baoting, Lingshui) xx-xxxx to 3xx-xxxx.
  

海口	898	Haikou (was 750)
琼山	898	Qiongshan (was 7691)
澄迈	898	Chengmai (was 8092)
琼海	898	Qionghai (was 7694, then 8096)
定安	898	Ding'an (was 8093)
文昌	898	Wenchang (was 7692, then 8094)
万宁	898	Wanning (was 7695, then 8097)
三亚	898	Sanya (was 7605)
通什	898	Tongshi (was 7684, then 899)
琼中	898	Qiongzhong (was 899)
乐东	898	Ledong (was 899)
保亭	898	Baoting (was 899)
陵水	898	Lingshui (was 899)
洋埔	898	Yangpu (was 890)
儋县	898	Danxian (was 7697, then 890)
儋州	898	Danzhou (was 890)
东方	898	Dongfang (was 7607, then 8003)
昌江	898	Changjiang (was 7608, then 8005)
白沙	898	Baisha (was 890)
临高	898	Lingao (was 890)
东方	898	Dongfang (was 7607, then 8003, 890)
昌江	898	Changjiang (was 7608, then 8005, 890)
屯昌	898	Tunchang