Analysis:
GSM and CDMA are different mobile phone communication systems.
All mobile networks are GSM networks.
Unicom has been promoting its own unique CDMA (and GSM network).
Not particularly successful.
GSM, the abbreviation of Global System for Mobile Communications, is translated into Chinese as Global System for Mobile Communications, commonly known as GSM. GSM is one of the major cellular systems in the world. GSM, based on narrowband TDMA system, rose in Europe in 1980s, and 199 1 was put into use. At present, all mobile phone systems in Europe and Africa and major countries in South America and Asia adopt GSM technology. GSM mobile phones account for 75% of the total mobile phones in the world, and by 2002, the global users had exceeded 600 million.
CDMA, the abbreviation of code division multiple access, is translated from Chinese into code division multiple access digital wireless technology. CDMA system is the second largest mobile communication system alongside GSM, which has the advantages of clear communication, high frequency utilization and low power consumption of mobile phones. The patent of CDMA chip belongs to Qualcomm. CDMA is considered as the first choice of the third generation mobile communication technology. At present, the standards are W-CDMA, CDMA2000 1X, TD-SCDMA.