Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 218 12/24/2010
755 CRSM invalid file ID
756 CRSM missing P parameter
757 CRSM invalid P parameter
758 CRSM missing command data
759 CRSM invalid characters in command data.
765 Invalid input value
766 Unsupported mode
767 Operation failed
768 Mux already running
769 Unable to get control
770 SIM network reject
771 Call setup in progress
772 SIM powered down
773 SIM file not present