Abstract: The present invention is directed to a access-control system for a telecommunication network which connects a serving telecommunication system to a plurality of telecommunication access terminals, comprising: at least one portable memory devices card, for storing a resident PIN and a number of access authorization codes and associated identification data; an access-control module for connection to a telecommunications access terminal, comprising user's interface means for communication between the user and said module, means for reading said resident PIN, means for validating an user's PIN input on said user's interface means for accessing said number of access authorization codes and associated identification data on said card, means for selecting a transaction profile on said user's interface means, means for transmitting a selected access authorization code and associated identification data for said transaction profile associated to said validated resident PIN to said serving telecommunication system over