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SIM COMMANDSThe mobile equipment communicates with the SIM using standard ISO 7816-3 Operating Procedures (a copy of parts 1, 2, and 3 can be foundhere).This transmission protocol uses Application Protocol Data Units (APDU), which can be either commands or responses. These are sent across the electrical interface between the SIM and the mobile equipment, or the SIM-ME interface for short.CLAINSP1P2P3DataCommand APDU format.There are five fields in an APDU command. The class of instruction (CLA) is always A0 for GSM. The instruction code (INS) indicates the particular command to be performed. P1, P2, and P3 are parameters for the command, with P3 containing the length of the Data segment, if any.DataSW1SW2Response APDU format.The response to a command is returned in three fields. The Data portion, if any, contains information requested in the command. SW1 and SW2 are status words indicating the success or failure of the command.A number of commands are defined for GSM SIM cards, including functions to read and write data, confirm security features, and run the GSM authentication algorithm. Completing an entire GSM procedure may require a series of APDU command/response pairs.COMMANDINSP1P2P3SELECTA4000002STATUSF20000lengthREAD BINARYB0offset (high)offset (low)lengthUPDATE BINARYD6offset (high)offset (low)lengthREAD RECORDB2record numbermodelengthUPDATE RECORDDCrecord numbermodelengthSEEKA200type/modelengthINCREASE32000003VERIFY CHV2000CHV number08CHANGE CHV2400CHV number10DISABLE CHV26000108ENABLE CHV28000108UNBLOCK CHV2C0000 (for CHV1)02 (for CHV2)10INVALIDATE04000000REHABILITATE44000000RUN GSM ALGORITHM88000000SLEEPFA000000GET RESPONSEC00000lengthSIM command coding.