COMMUNICATIONS SYSTEM, MOBILE COMMUNICATIONS DEVICE, TRANSITION CONTROL DEVICE, TRANSITION CONTROL METHOD, AND TRANSITION CONTROL PROGRAM

In order to perform SM swap efficiently, a mobile communication device that performs mobile communication includes: an attachment unit for attaching thereto an embedded subscriber identity module (eSIM) that stores therein an Operational Profile (OP) and a Provisioning Profile (PP); a PP reception unit for receiving, through a mobile communication network associated with the OP stored in the eSIM, the PP associated with an Subscription Manager (SM) corresponding to a destination mobile communication network, and storing the received PP in the eSIM; and an OP reception unit for performing communication with the SM using the stored PP associated with the SM to receive the OP associated with the mobile communication network, and storing the received OP in the eSIM.