The invention relates to a method for the provision of operator-specific performance features of different mobile radio network operators for a mobile radio customer, whereby the mobile radio customer has a smart card, on which a user relationship for the mobile radio customer with a mobile radio network operator is stored. The method is characterized in that at least two user relationships are defined on the smart card of the mobile radio customer with differing mobile radio call numbers and with independent performance features and a mobile radio network operator is assigned to each user relationship.