AT+CRSM – reading files from the SIM

AT+CRSM – reading files from the SIM

Read files from the AnyNet Secure SIM. For precise formats and response details, refer to the modem provider documentation.

We recommend that you use AT+CRSM over the generic SIM access AT+CSIM. AT+CRSM provides easier access to the SIM file system, as the modem facilitates the SIM interface locking and file selection routines.

This command describes fields required for Eseye file extraction. Refer to 3GPP TS 27.007 for the complete definition.

Command syntax

Use the following command:

AT+CRSM=<command>[,<fileid>[,<P1offset>,<P2offset>,<P3readlength>[,<data>[,"<pathid>"]]]]

The command includes these parameters:

• command is passed to the SIM. Use 176 (READ BINARY) to extract security and identity information.
• fileid is the integer file identifier on the SIM. See Available files and sizes.
• P1offset, P2offset, and P3readlength define the read offset and length. AT+CRSM returns up to 255 bytes per read.

  • P1offset contains the upper 8 bits of the 16-bit file offset.
  • P2offset contains the lower 8 bits of the 16-bit file offset. It can include the modulus (MOD) operator.
  • P3readlength is the integer read length. Limit it to 255 bytes.
• data is unused for READ BINARY. Leave it empty.
• pathid is the elementary file path in hexadecimal. Use "3F007FEE" for AnyNet Secure SIM files.

You can use +, -, /, and * arithmetic operators in the offset parameters.

Returned result

A successful command returns:

+CRSM: <sw1>,<sw2>[,"<RETURNEDDATA>"]

A failed command returns:

+CME ERROR: <err>

The response fields are:

• sw1 and sw2 describe command execution. They can indicate success or file-read errors.
• RETURNEDDATA contains successful response data as an ASCII hexadecimal string.
• err is the error result when the command cannot pass to the SIM.