| 摘要 |
A subscriber identity module (SIM) card for mobile telephones contains a field of abbreviated dialing numbers (AND) and/or fixed dialing numbers (FDN) data records, corresponding to the GSM specification for storing telephone entries. The AND data record (or FDN data record) contains a sector that references a first extension data record. In this case, the first extension data record, contains three sectors, and has in its first sector an identifier that identifies it as a "hierarchical" data record. The extension data record refers to one or more further data structures that define the hierarchical order of the telephone entries. Furthermore, it is possible to form a chain of extension data records which refer to one another, and in which all extension data records are hierarchical starting from a specific index. |
