IMSI Byte Converter

Author: Dustin_Chen, email: Dustin_Chen@compal.com or chuhpsdustin@gmail.com

• Refer 3GPP Spec:
  • ETSI TS 123 003 chap 2.2 Composition of IMSI
    
  • GSM 11.11 Version 5.1.0 March 1996
    

• IMSI to QXDM_Byte
  • Please use AT command(ex: adb shell atcli at+cimi) to search for the IMSI of UE mifi and paste 15 digits below
    • IMSI: convert

• QXDM_Byte to IMSI
  • Please search IMSI in QXDM and paste IMSI BCD Byte below
    • Byte： convert

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【Example】
	// UE QXDM_log
	03:45:02.667    SUBSYS RX       [0004/0015]     WCDMA/Additional Status Response          WCDMA L1 State: L1M_STOPPED
	IMSI BCD Length = 8
	Byte = { 0x49, 0x66, 0x66, 0x00, 0x00, 0x50, 0x25, 0x14 } 

	03:05:13.779    QTRACE          [  47/ 0/2]     MM/LowFreq/High/REG    [reg_send.c   2176] DS: SUB 0 =REG= MMR_REG_REQ PLMN(466-66) RAT(0-GSM,1-W,2-LTE,3-TDS,4-NR5G) = 4 trans_id 232,  scan_scope=0
	
	// Wireshark: rantcp-20230726-114645.pcap
	44	2023-07-26 11:45:31.918911	192.168.45.2	192.168.45.1	F1AP/NR RRC/NAS-5GS	SACK (Ack=5, Arwnd=352516352) , ULRRCMessageTransfer, UL Information Transfer, Identity response MAC=0x00000000							
	    Message type: Identity response (0x5c)
	    5GS mobile identity
 	       Length: 13
     	   0... .... = Spare: 0
     	   .000 .... = SUPI format: IMSI (0)
     	   .... 0... = Spare: 0
      	  .... .001 = Type of identity: SUCI (1)
      	  Mobile Country Code (MCC): Taiwan (466)
      	  Mobile Network Code (MNC): Unknown (66)
      	  Routing indicator: 0
      	  .... 0000 = Protection scheme Id: NULL scheme (0)
      	  Home network public key identifier: 0
      	  MSIN: 0000055241