Method for incorporating subscriber identity data into a subscriber identity module

A method for incorporating subscriber identity data into a subscriber identity module, with the subscriber identity module being incorporated in ready-to-operate condition in an end device, and the subscriber identity module being arranged to manage a plurality of subscriber identity data and to receive subscriber identity data, and with said subscriber identity data being stored in a file system, comprising the method steps of:

• receiving a load command from a subscriber identity data management in the subscriber identity module;
• preparing the file system in the memory area of the subscriber identity module for storing subscriber identity data;
• receiving subscriber identity data in the subscriber identity module;
• storing the subscriber identity data in the prepared file system;
• and
• checking the data integrity of the received subscriber identity data by the subscriber identity module,
• wherein preparing the file system comprises creating a shadow directory at the same level as a root directory in the file system of the subscriber identity module, and the subscriber identity data are received in the shadow directory, with the end device having no access to the shadow directory at the preparing time.