How do I check for error for module?

AT+CMEE is the AT Command that enables the modem to report errors. It is important that
error reporting is enabled as it allows for the application to take action based on the error result.
AT+CMEE=1   Enable numeric error codes (the error response includes a value to indicate the detail of the error in question. For example, error value 10 means no SIM inserted.
AT+CMEE=2   Enable verbose error code (the error response includes a text string describing the error situation. For example “SIM not inserted.
Refer to AT Command Guide for more details.

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