A method at a mobile entity for enabling use of multiple Internet Protocol, IP, Multimedia Services, IMS, the method comprising: reading data from a first IMS Subscriber Identity Module, ISIM, of a plurality of IMS Subscriber Identity Modules, ISIMs, associated with the mobile entity; the ISIMs being located at the mobile entity ; the reading comprising determining if an application identifier file, EF AIDAPP , is present in the first ISIM; if the application identifier file, EF AIDAPP , is present, storing the application identifier file, EF AIDAPP , data at an internal memory of the mobile entity ; and creating a binding in the internal memory of the mobile entity to bind a function at the mobile entity to one ISIM of the plurality of ISIMs, wherein the creating comprises: selecting application identifier file, EF AIDAPP , data data from the first ISIM; determining whether an indication in the application identifier file, EF AIDAPP , data for the first ISIM includes an indication for the function; if the indication in the application identifier file, EF AIDAPP , data includes the indication for the function, determining the first ISIM to be the one ISIM to be bound to the function and binding the first ISIM to the function; and if the indication in the application identifier file, EF AIDAPP , data does not include the function, selecting application identifier file, EF AIDAPP , data from a different ISIM of the plurality of ISIMs, wherein when the selected function is invoked, the one ISIM bound to the selected function is used. reading data from a first IMS Subscriber Identity Module, ISIM, of a plurality of IMS Subscriber Identity Modules, ISIMs, associated with the mobile entity; the ISIMs being located at the mobile entity ; the reading comprising determining if an application identifier file, EF AIDAPP , is present in the first ISIM; if the application identifier file, EF AIDAPP , is present, storing the application identifier file, EF AIDAPP , data at an internal memory of the mobile entity ; and creating a binding in the internal memory of the mobile entity to bind a function at the mobile entity to one ISIM of the plurality of ISIMs, wherein the creating comprises: selecting application identifier file, EF AIDAPP , data data from the first ISIM; determining whether an indication in the application identifier file, EF AIDAPP , data for the first ISIM includes an indication for the function; if the indication in the application identifier file, EF AIDAPP , data includes the indication for the function, determining the first ISIM to be the one ISIM to be bound to the function and binding the first ISIM to the function; and if the indication in the application identifier file, EF AIDAPP , data does not include the function, selecting application identifier file, EF AIDAPP , data from a different ISIM of the plurality of ISIMs, selecting application identifier file, EF AIDAPP , data data from the first ISIM; determining whether an indication in the application identifier file, EF AIDAPP , data for the first ISIM includes an indication for the function; if the indication in the application identifier file, EF AIDAPP , data includes the indication for the function, determining the first ISIM to be the one ISIM to be bound to the function and binding the first ISIM to the function; and if the indication in the application identifier file, EF AIDAPP , data does not include the function, selecting application identifier file, EF AIDAPP , data from a different ISIM of the plurality of ISIMs, wherein when the selected function is invoked, the one ISIM bound to the selected function is used. <EOS>