1. In terms of networking and base station distribution, it is cellular communication (it seems that this is nonsense, and now operators and equipment manufacturers basically build networks in this way).
2.
China Mobile's 2G network standard is GSM/GPRS/EDGE from Europe, and its technology is mainly developed by Ericsson in Sweden, Nokia in Finland and Siemens in Germany. The 3G network standard is TD-SCDMA/TD-HSDPA/TD-HSUPA, which is mainly formulated by Chinese and foreign companies such as China Datang and German Siemens, and is regarded as the 3G technology dominated by China.
The 2G network standard of China Unicom is also GSM/GPRS/EDGE, and the 3G network is WCDMA/HSDPA/HSUPA. 3G of WCDMA system is upgraded from GSM system, and WCDMA technology is the fusion of several technologies in Europe and Japan. Ericsson, Nokia, Siemens, Fujitsu and Aka are all major research and development companies of WCDMA technology, and ZTE and Huawei in China also have some WCDMA patents.
The 2G network standard of China telecom is CDMA IS95/CDMA 1X, and the 3G network is cdma2000 ev-do rev.a/b, which was led by Qualcomm, with the participation of Ericsson, Nokia and Siemens.
3. At present, in the global 2G competition, the GSM camp has basically won, accounting for 85% of users! In the global 3G competition, WCDMA from GSM camp also occupies an overwhelming advantage: 76% of 3G users choose WCDMA, and more than 200 operators in hundreds of countries and regions around the world deploy WCDMA networks. Up to 2000 kinds of mobile phones are supported, from Nokia 5230, C5-00 arcade to the famous iPhone 4, all of which support WCDMA/HSDPA! Theoretically and practically, the network speed is the fastest in WCDMA! Subsequent 4G evolution technologies include HSPA+ and FDD-LTE! However, CDMA2000 is going downhill all over the world, not to mention TD-SCDMA. At present, the number of 3G users of the three major operators in China is almost the same. Personally, I choose Unicom to do 3G on my mobile phone, because there are many models, fast network speed and good coverage (all cities have 3G signals in urban areas and counties), and the tariff is average (minimum 46 yuan package). If it is a laptop network card, choose telecommunications, the signal is the best, the network speed is not as stable as Unicom, and the tariff is cheap.
All the above are original by hand, I hope you are satisfied with my answer, thank you!