After 5 minutes CREG becomes 0,3

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  1. SIM card from Telcel operator

    CPIN returns ERROR (SIM Failure or SIM Busy)

    then CREG becomes 1,3

    I have to CFUN=4 …. CFUN =1

    CPIN then is READY

    CREG 1,2

    CREG 1,1

     ….. (afte 4-5 minutes)

    CREG 1,3 

     

     then I have to CFUN=4 and CFUN=1

     

    Do you have any clue about what is happening?

     

     below the commands and timestamp

     

    1:18:19:40: AT+CREG?
    AT+CREG?
    +CREG: 1,3
    OK

     

    1:18:19:49: AT+CPIN?
    AT+CPIN?
    ERROR

     

    1:18:19:55: AT+CFUN?
    AT+CFUN?

    +CFUN: 1

    OK
    1:18:19:57: AT+CFUN=4
    AT+CFUN=4

    OK
    1:18:20:03: AT+CFUN=1
    AT+CFUN=1

    OK

    AT+CREG?

    +CREG: 1,3
     

    1:18:30:34: AT+CFUN=4
    AT+CFUN=4

    OK
    1:18:30:39: AT+CFUN=1
    AT+CFUN=1

    OK
    1:18:30:43: AT+CFUN?
    AT+CFUN?

    +CFUN: 4

    OK
    1:18:30:49: AT+CREG?
    AT+CREG?

    +CREG: 1,2

    OK
    1:18:30:56: AT+CREG?
    AT+CREG?

    +CREG: 1,2

    OK
    1:18:30:59: AT+CREG?
    AT+CREG?

    +CREG: 1,1

    1:18:31:13: AT+CREG?
    AT+CREG?

    +CREG: 1,3

    OK
    1:18:31:24: AT+CFUN=4
    AT+CFUN=4

    OK
    1:18:31:27: AT+CFUN=1
    AT+CFUN=1

    OK
    1:18:31:29: AT+CREG?
    AT+CREG?

    +CREG: 1,0

    OK
    1:18:31:36: AT+CPIN?
    AT+CPIN?

    +CPIN: READY

    ———————————————————————–
    Also at first power up the SIM returns STN# 37 why?

     

    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

    ——————————————————————————-