It is recommended to purchase dual-mode 5G mobile phones that support both NSA and SA after 2020, which is the main entrance of mobile Internet, and also the carrier of voice services and various data services. The network standard supported by the 5G mobile phone determines the network it can access. As mentioned above, the 5G has two networking modes, NSA and SA. A single mobile phone that supports one network mode cannot access another network. Due to the early completion of the NSA standard and the rapid maturity of the industry chain, the mobile phone chip supporting NSA has been tested, and the mobile phone chip supporting SA is still in the testing stage, and the development speed is slow. Limited by mobile phone chips, currently only Huawei's mate 30 supports both NSA and SA, and other brands of mobile phones can only support NSA. The Ministry of Industry and Information Technology requires that 5G mobile phones listed in 2020 must support both NSA and SA, and mobile phones that only support NSA will not be able to access the network. It can be predicted that mobile phones that only support NSA will be listed before 2020. China's operators have adopted the SA network as the ultimate goal. Although the NSA and SA hybrid networks may be adopted in the early stage, it means that only the supported NSA phones can only use the 5G network under the NSA network. Therefore, users who want to purchase 5G mobile phones are advised to purchase dual-mode 5G terminals that support both NSA and SA after 2020.