A high-capacity SIM card includes: memory having at least one partition and a memory controller configured: to control at least two modes of access to one partition of the partitions, only one of the modes being a currently-active mode; and to allow the currently-active mode to be operationally changed remotely. Preferably, the memory controller controls operability of reading data, writing data, erasing data, and/or executing code, according to the currently-active mode. Preferably, the memory controller also controls storage of data in the card based on access-control data delivered to the card. Preferably, the memory controller is configured to reversibly operationally change, for one partition, which mode is the currently-active mode. Preferably, the memory controller prohibits change of the currently-active mode by a host device of the card.