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How to query PIN counter on EHSx

Tutorial, March 22, 2016 - 10:02am, 7182 views

EHSx doesn't have a special command like AT^**** on BGS2 to query available remaining PIN counter, but this doesn't mean one has to give up on EHSx or any module that doesn't have a PIN counter query command.

To read SIM PIN counter more complex procedure is required:

1. Check whether the card is SIM or USIM AT+CRSM=242 The response can be for example +CRSM: 144,0,"62298202782183023F00A509800131830400006D988A01058B032F0603C60C90016083010183010A83010D" (USIM response – the firs byte is 0x62) or +CRSM: 144,0,"000000007F2002FAFFAAFF010E1300170600838A818A0083000022" (SIM response) 

2. For USIM scenario (see also ETSI TS 102 221), use AT+CSIM=14,"00A4000C027FFF" to select the USIM Application directory first, then send additional commands:

a. Use AT+CSIM=10,"0020000100" to check the PIN counter 

b. Use AT+CSIM=10,"002C000100" to check the PUK counter 

c. Use AT+CSIM=10,"0020008100" to check the PIN2 counter 

d. Use AT+CSIM=10,"002C008100" to check the PUK2 counter

The responses will be either

+CSIM: 4,"63CX" where X is the hex-value of remaining retries for the  corresponding key (usually X is 0-A = 0-10 retries remaining)

+CSIM: 4,"6A88" which means that the corresponding key is not initialized (= not available)

+CSIM: 4,"6983" which means that the corresponding key is blocked. 

Appears every subsequent check after 63C0 has been reached (example: 63C3 -> 63C2 -> 63C1 -> 63C0 -> 6983 -> 6983 .).

Example for PIN counter check with prior USIM Application directory selection:

AT+CSIM=14,"00A4000C027FFF";+CSIM=10,"0020000100"

+CSIM: 4,"9000" -> response of USIM Application directory selection, 

-> will always be '9000' = successful

+CSIM: 4,"63C3" -> 3 retries left

OK

Examples for AT+CPIN with wrong PIN:

AT+CPIN=9998

+CME ERROR: incorrect password

AT+CSIM=14,"00A4000C027FFF";+CSIM=10,"0020000100"

+CSIM: 4,"9000" -> response of USIM Application directory selection, 

'9000' = successful

+CSIM: 4,"63C2" -> 2 retries left

Examples for AT+CPIN with correct PIN:

AT+CPIN=9999

OK

AT+CSIM=14,"00A4000C027FFF";+CSIM=10,"0020000100"

+CSIM: 4,"9000" -> response of USIM Application directory selection, 

'9000' = successful

+CSIM: 4,"63C3" -> 3 retries left

Example for PUK (UNBLOCK PIN) retry counter:

AT+CSIM=14,"00A4000C027FFF";+CSIM=10,"002C000100"

+CSIM: 4,"9000" -> response of USIM Application directory selection, 

'9000' = successful

+CSIM: 4,"63CA" -> A = 10 retries left

3. SIM scenario (see also 3GPP TS 11.11)

The AT+CRSM=242 response for SIM is for example:

+CRSM: 144,0,"000000007F2002FAFFAAFF010E1300170600838A818A0083000022"

The following PIN/PUK status bytes have to be decoded, they are available at fixed positions within the CRSM response:

Byte 19 = PIN status, decoding see below (example 0x83 = PIN initialized, 3 false presentations remaining) Byte 20 = PUK status, decoding see below (example 0x8A = PUK initialized, 10 false presentations remaining) Byte 21 = PIN2 status, decoding see below (example 0x81 = PIN2 initialized, 1 false presentation remaining) Byte 22 = PUK2 status, decoding see below (example 0x8A = PUK2 initialized, 10 false presentations remaining) Decoding guide for each PIN/PUK status Bytes:

Bit 8: 0 = code not initialized, 1 = code initialized Bits 4-1: number of false presentations remaining

(example)

[2016-03-22 15:41:35.8] ati

[2016-03-22 15:41:36.8] Cinterion

[2016-03-22 15:41:36.8] EHS5-E

[2016-03-22 15:41:36.8] REVISION 03.001

[2016-03-22 15:41:36.8] OK

[2016-03-22 15:41:37.5] at+cpin?

[2016-03-22 15:41:40.2] +CPIN: SIM PIN

[2016-03-22 15:41:40.2] OK

[2016-03-22 15:41:54.2] AT+CRSM=242

[2016-03-22 15:41:54.3] +CRSM: 145,98,"6242820278218410A0000000871002FF47F00189000001FFA5118001718103010A3282010A83040000C3F08A01058B032F0605C6099001C08301018301818104000013BC"

[2016-03-22 15:41:54.3] OK

[2016-03-22 15:42:06.7] AT+CSIM=10,"0020000100"

[2016-03-22 15:42:08.0] +CSIM: 4,"63C3"

[2016-03-22 15:42:08.0] OK

[2016-03-22 15:42:37.7] at+cmee=2

[2016-03-22 15:42:41.6] OK

[2016-03-22 15:42:43.4] at+cpin="1234"

[2016-03-22 15:42:48.2] +CME ERROR: incorrect password

[2016-03-22 15:43:01.8] AT+CSIM=10,"0020000100"

[2016-03-22 15:43:01.9] +CSIM: 4,"63C2"

[2016-03-22 15:43:01.9] OK

[2016-03-22 15:43:15.6] at+cpin="2222"

[2016-03-22 15:43:15.7] +CME ERROR: incorrect password

[2016-03-22 15:43:19.0] AT+CSIM=10,"0020000100"

[2016-03-22 15:43:19.1] +CSIM: 4,"63C1"

Based on the knowledge, we can wrap the used AT commands inside a Java MIDlet so that it can help us to check the SIM PIN/PUK status on one given SIM card.

Author

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antonyshen