The GID1 and GID2 elementary files on the SIM are specified in GSM 11.11 (ETS 300 977)
启用它，须在SIM Service Talbe中做出合适的标记
GID1 (Group Identifier Level 1) – an identifier for a particular SIM and handset association, which can be used to identify a group of SIMs involved in a particular application.
GID2 (Group Identifier Level 2) – a GID1-like identifier
主要用来标识虚拟运营商