What is Apple's cellular mobile data network?

The cellular data of Apple mobile phone adopts packet technology from data transmission to exchange. When cellular data is turned off, it means that the network is turned off and the mobile phone cannot access the Internet. Cellular mobile data technology is mainly adopted by special mobile data communication system, which can only provide mobile data users with the connection with packet-switched data network users, that is to say, cellular mobile data network is equivalent to a traffic switch, and it must be turned on to access the Internet with traffic.

Extended data cellular mobile communication adopts cellular wireless networking mode, which connects terminals and network devices through wireless channels to realize mutual communication between users in activities. Its main feature is the mobility of the terminal, which has the functions of switching over LAN and automatic roaming. Cellular mobile communication service refers to voice, data, video and image services provided through a cellular mobile communication network composed of a base station subsystem and a mobile switching subsystem.

References:

Baidu Encyclopedia-Cellular Mobile Communication