The present document defines the Universal Subscriber Identity Module (USIM) application. This application resides on the UICC, an IC card specified in TS 31.101 [11]. In particular, TS 31.101 [11] specifies the application independent properties of the UICC/terminal interface such as the physical characteristics and the logical structure. TS 31.101 is one of the core documents for this specification and is therefore referenced in many places in the present document. The detailed descriptions are no longer listed in TS 31.101, so references to TS 31.101 shall be taken to be direct references to TS 102 221.