Multi-Tech Systems GPRS (MTMMC-G) 사용자 설명서

Chapter 7 – Security Commands 

Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 

40 

 

Description: 

This command enters the ME passwords (CHV1 / CHV2 / PUK1 / PUK2, etc.), that are required before 
any ME functionality can be used. 

CHV1/CHV2 is between 4 and 8 digits long, PUK1/PUK2 is only 8 

digits long.  

If the user application tries to make an outgoing call before the SIM PIN code (CHV1) has been 
confirmed, then the product will refuse the “ATD” command with a “+CME ERROR: 11” (SIM PIN 
required).  

 

The application is responsible for checking the PIN after each reset or power on - if the PIN was 
enabled. 

Values:  

<pin> is the Personal Identification Number. A four-digit number.  

 <puk> is the Personal Unblocking Key needed to change the PIN. An eight-digit number. 

Syntax:   

AT+CPIN=<pin> 

AT+CPIN=1234 
Note: Enter PIN 

OK 
Note: PIN code is correct 

AT+CPIN=5678 
Note: Enter PIN 

+CME ERROR: 3 
Note: Operation not allowed, PIN previously entered 

 

After 3 unsuccessful attempts to enter the PIN (Personal Identification Number), the PUK (Personal 
Unblocking Key) will be required.  

 

PUK validation forces the user to enter a new PIN code as a second parameter and this will be the new 
PIN code if PUK validation succeeds. CHV1 is then enabled if PUK1 is correct. The application 
therefore uses this command:   

 

AT+CPIN=00000000,1234 
Note: Enter PUK and new PIN 

+CME ERROR: 16 
 Note: Incorrect PUK 

AT+CPIN=12345678,1234 
Note: Enter PUK and new PIN, 2nd attempt 

OK 
Note: PUK correct, new PIN stored 

 

To determine which code must be entered (or not), the following query command can be used: 
AT+CPIN?   The possible responses are: 

+CPIN: READY 

ME is not pending for any password 

+CPIN: SIM PIN 

CHV1 is required 

+CPIN: SIM PUK 

PUK1 is required 

+CPIN: SIM PIN2 

CHV2 is required 

+CPIN: SIM PUK2 

PUK2 is required 

+CPIN: PH-SIM PIN 

SIM lock (phone-to-SIM) is required 

+CPIN: PH-NET PIN 

Network personnalisation is required 

+CME ERROR: <err> 

SIM failure (13) absent (10) etc. 

Please note that in this case the mobile equipment does not end its response with the OK string. 

The response +CME ERROR: 13 (SIM failure) is returned after 10 unsuccessful PUK attempts. The SIM 
card is then out of order and must be replaced by a new one.