name: USAT
full_form: USIM/SIM Application Toolkit
context: in a secured packet, or the SOR-CMCI received in plain text. If the UE receives SOR information containing the list of preferred PLMN/access technology combinations or SOR-SNPN-SI without SOR-CMCI, or the ME receives USAT REFRESH with command qualifier (see 3GPP TS 31.111 [41]) of type "Steering of Roaming" without SOR-CMCI, or the security check of the received steering of roaming information is not successful as described in clause C.2, clause C.3 and clause C.4.3, then: 1) if the UE has SOR-CMCI stored in the non-volatile memory of the ME, the UE shall use the SOR-CMCI stored in the non-volatile memory of the ME; and 2) if the UE has no SOR-CMCI stored in the non-volatile memory of the ME, the UE shall use the SOR-CMCI stored in the USIM, if any. The UE shall delete the stored SOR-CMCI, if any, in the non-volatile memory of the ME and store the received SOR-CMCI in the non-volatile memory of the ME when: 1) the ME receives SOR-CMCI in the USAT REFRESH with command qualifier (see
description: The User Services Identity Module/SIM Application Toolkit (USAT) is a network function that enables the management of user services and applications on the Universal Integrated Circuit Card (UICC). It provides a set of tools for the UE to interact with the network, including the storage and management of SOR-CMCI information.
explanation: The context describes USAT's role in managing user services, applications, and interactions between the UE and the network, which are key characteristics of a Network Function.
section_title: 6.3.2.1Steering of UE in roaming after registration / SOR-CMCI rule / DNN of the PDU session / DL NAS transport
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