Abstract: A mobile phone uses a subscriber identification card which includes memory used by the mobile phone as external auxiliary memory. The mobile phone itself includes memory and can transfer data from the card's memory to the phone's memory. The card executes commands for updating data contained in the card's memory which is transmitted by short mobile phone messages to the mobile phone and eliminates the commands contained in the short messages after they are executed. The mobile phone can detect if data has been eliminated from a short message by the subscriber identification card and triggers the phone's memory to transfer data when elimination of data has been detected.