11.113GPPRelease 1999Specification of the Subscriber Identity Module - Mobile Equipment (SIM-ME) InterfaceTS

This subclause contains a figure depicting the file structure of the SIM. DF_GSM shall be selected using the identifier ‘7F20’. If selection by this means fails, then DCS 1800 MEs shall, and optionally GSM MEs may then select DF_GSM with ‘7F21’.

NOTE 1: The selection of the GSM application using the identifier ‘7F21’, if selection by means of the identifier ‘7F20’ fails, is to ensure backwards compatibility with those Phase 1 SIMs which only support the DCS 1800 application using the Phase 1 directory DF_DCS1800 coded ‘7F21’.

NOTE 2: To ensure backwards compatibility with those Phase 1 DCS 1800 MEs which have no means to select DF_GSM two options have been specified. These options are given in GSM 09.91 [17].

NOTE 3: The value ‘6F65’ under DFGSM was used in earlier versions of this specification, and should not be re-assigned in future versions.

Figure 8: File identifiers and directory structures of GSM