A Trusted Service Manager (TSM) receives via a first communication channel from a Service Provider (SP) a request (REQ(MIA)) that contains an application (MIA) together with a unique identifier of a mobile phone (MOB), particularly its telephone number. The mobile phone (MOB) is equipped with a memory device (MIF) that comprises multiple memory sectors being protected by sector keys. Preferably the memory device (MIF) is a MIFARE device. The TSM extracts the application (MIA) and the unique identifier from the received request, assigns destination sector(s) and associated sector key(s) of the memory device (MIF), compiles the application (MIA), the sector key(s) and the sector number(s) of the destination sector(s) into a setup-message (SU(MIA)), encrypts the setup-message and transmits it to either the mobile phone via a second communication channel or the Service Provider via the first communication channel (CN). If the setup-message (SU(MIA)) is transmitted to the Service Provider, the Service Provider sends it over the second communication channel to the mobile phone.