The invention relates to a method for requesting users access to an application by a network. The application is provided by an entity that is not part of the network. The invention allows a unified access to the application independent from the network used to access it. Therefore a network receiving an access request for the application from a user determines through which network the user attempted to access the application the first time. It then requires the identifier used by the network of first access and uses the same identifier towards an entity providing said application.