Cloud SIM (subscriber identity module) capable of freely downloading network data

The invention discloses a cloud SIM (subscriber identity module) capable of freely downloading network data. The cloud SIM comprises a network data downloading module, a key store, an operator database, a network data authentication module, an authentication module, a network selection module, a command interpretation module and an interface communication module. According to the scheme provided by the invention, subscribers can freely download network authentication data and network configuration data of an operator server, so the subscribers can use different operator networks through the same SIM card, the operation freedom degree of the subscribers is greatly improved, and in addition, the subscribers can download different network authentication data for handling different services, so the service handling efficiency of the subscribers is improved. Therefore, the cloud SIM provided by the invention has the advantages that different operator networks can be replaced for communication, so convenience is brought for users.