CREG 3 after some minutes

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  1. Module:

    GM862-GPS

    07.03.401
     

    SIM card from Telcel(Mexico) operator

    CPIN returns ERROR (SIM Failure or SIM Busy)

    then CREG becomes 1,3, so I have to CFUN=4 …. CFUN =1 and then CPIN then is READY

    CREG then reports CREG 1,2
    and then REG 1,1
     ….. (after 4-5 minutes)
    it becomes
    CREG 1,3

     

     then I have to CFUN=4 and CFUN=1
    and it happens again.
     
    Any clue about what is happening?

    Below the commands and timestamp, also I include at bottom STIA and SATR commands

     

     1:17:49:54:
    +CREG: 3
    1:17:53:39: AT+CPIN?
    AT+CPIN?

    ERROR
    1:17:53:45: AT+CFUN=4
    AT+CFUN=4

    OK
    1:17:53:47: AT+CFUN=1
    AT+CFUN=1

    OK
    1:17:53:59:
    +CREG: 2
    1:17:54:05:
    +CREG: 1
    1:17:55:31:
    +CREG: 3

    1:18:13:59: AT+CFUN=4
    AT+CFUN=4

    OK
    1:18:14:03: AT+CFUN=1
    AT+CFUN=1

    OK
    1:18:14:06: AT+CREG?
    AT+CREG?

    +CREG: 1,0

    OK
    1:18:14:11: AT+CPIN?
    AT+CPIN?

    +CPIN: READY

    OK

    1:18:15:26: AT#CPIN?
    AT#CPIN?

    ERROR
    1:18:15:39: AT+CFUN=4
    AT+CFUN=4

    OK
    1:18:15:41:
    +CREG: 0
    1:18:15:45: AT+CFUN=1
    AT+CFUN=1

    OK
    1:18:15:55:
    +CREG: 2
    1:18:15:58:
    +CREG: 1
    1:18:16:05:
    +CREG: 3

    ———————————————————————–

    Other questions regarding this Bad SIM:

     

    After several CFUN=4, CFUN=1, #reboot when I got CPIN=ERROR the Telit reboots and sometimes returns a "#STN: 37" string.  Do you know why? I don’t use STIA

     

    Also I tried the STIA command in BAD SIM and it returns (With CMEE=2)

     1:18:30:26: AT#STIA?
    AT#STIA? +CME ERROR: SIM failure

     

    In a "normal" SIM it returns:

     1:20:43:14: AT#STIA? <– NORMAL SIM#STIA: 1,2,10,7fffffff7f00005f06000000000000000000

     ————————————————————————

     I tried SIMATR in BAD SIM

    AT#SIMATR

    #SIMATR: FE3B3B9600A74C900000046855559000

     

     In a "normal" SIM it returns:

     1:20:25:59: AT#SIMATR

    #SIMATR: 3BFF950000C00A1F438031E073F62113574A430E1831303063

    ——————————————————————————-