The second stage: 1994 turn1999-China Unicom cleans up "Chinese and foreign" projects;
The third stage: 1999 to 2000-Unicom's overseas listing and financing;
The fourth stage: in 2002, Unicom CDMA began to compete for the telecom market;
The fifth stage: from 2002 to now-the great development of China Unicom's value-added services.