Multitech MultiConnect MTC-L4G2D User Manual page 34

CONFIGURING AND COMMUNICATING WITH YOUR DEVICE
4 Deletes all messages.
For example:
AT+CMGD=1 (delete message at index 1)
AT+CMGD=2 (delete message at index 2 )
AT+CMGD=1,0
AT+CMGD=1,1
AT+CMGD=1,2
AT+CMGD=1,3
AT+CMGD=1,4
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MultiConnect Cell MTC-L4G2D User Guide