Abstract: A communication agent method, involving a server, a first mobile device and a second mobile device communicated with the server in wireless, the method comprising steps of: via the first mobile device, logging in the server with a MSISDN and requesting a specific number according to the MSISDN; via the server, returning the specific number binding with the MSISDN; sending an authorization message to the first mobile device for confirming, if the second mobile device request to the server for logging in the server with specific number of the first mobile device; and via the second mobile device, logging in the server with the specific number of the first mobile device, if the first mobile device confirming the authorization message.

Abstract: A communication agent method, involving a server, a first mobile device and a second mobile device communicated with the server in wireless, the method comprising steps of: via the first mobile device, logging in the server with a MSISDN and requesting a specific number according to the MSISDN; via the server, returning the specific number binding with the MSISDN; sending an authorization message to the first mobile device for confirming, if the second mobile device request to the server for logging in the server with specific number of the first mobile device; and via the second mobile device, logging in the server with the specific number of the first mobile device, if the first mobile device confirming the authorization message.

Abstract: An instant communication system comprising an instant communication server, a plurality of mobile terminals, and a communication network is provided; the instant communication server includes an instant communication server processor and an instant communication server memory electrically connected to the instant communication server processor; each of the mobile terminals includes a terminal central processor, a terminal communication processor, a display unit, a terminal memory, and at least one information storage unit configured for storing a CID (Calling ID); the terminal central processor is electrically connected with the display unit and the terminal communication processor respectively; the terminal communication processor is further electrically connected with the information storage unit to obtain the CID. The following advantageous effect can be achieved: communications using different phone numbers of one mobile terminal can be distinguished from each other.