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The following table shows the +CACM parameters.

This command sets the Advice of Charge accumulated call meter maximum value in the SIM file, 
EFACMmax. ACMmax contains the maximum number of home units the subscriber is able to 
consume. When the ACM (

) reaches 

ACMmax, additional calls (mobile-originated and mobile-terminated calls that incur charges) are 
prohibited, except for emergency calls. Refer to GSM 02.24.

The Set command resets the 
accumulated call meter value. SIM 
PIN2 is required.

The Read command displays the 
current value of ACM.

The Test command indicates whether 
the +CACM command is functioning.

SIM PIN2 password
Maximum string length is 8 characters. If this value is exceeded, the command 
terminates in an error. If PIN2 is incorrect, "+CME ERROR: incorrect password" is 
displayed.

Accumulated call meter maximum value (similar to CCM; 

). The default is 0.

<ccm>
String type; three bytes of the current call meter value in hexadecimal format (for 
example, 00001E indicates a decimal value of 30). Value is given in home units; bytes 
are similarly coded as the ACMmax value in the SIM.