China Unicom, China Mobile and China Telecom are the three major mobile phone communication operators in China, all of which provide mobile phone communication related services. The differences are as follows: the network used by China Unicom is 4G: FDD-LTE/TDD-LTE; 3g:WCDMA； 2g:GSM. The mobile network is 4g: TDD-LTE; 3g:TD-SCDMA； 2g:GSM. The networks used by telecommunications are: 4G: FDD-LTE/TDD-LTE; 3g:CDMA 2000； 2g:CDMA. The different networks used lead to different mobile phones for the mobile phone cards of operators. Network coverage should be judged according to the place of use. As for the tariff package, each has its own characteristics.