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Try the below script in the AT Command Tester tool
//Script: at_cmgd.at //Use this script to AT+cmgd AT command //Get the command support AT+cmgd=? WAIT=2 //Delete SMS message at index 1 AT+cmgd=1 WAIT=1 //Delete SMS message at index 2 AT+cmgd=2 WAIT=1 //Delete SMS message at index 3 AT+cmgd=3 WAIT=1 //Delete all read messages SMS messages, leave unread //messages and stored MO messages untouched AT+cmgd=,1 WAIT=1 //Delete all read messages SMS messages and sent Mobile //originated messages, leave unread messages and unsent MO //messages untouched AT+cmgd=,2 WAIT=1 //Delete all read messages SMS messages. sent and unsent //Mobile originated messages, leave unread messages untouched AT+cmgd=,3 WAIT=1 //Delete all messages including unread messages AT+cmgd=,4 WAIT=1
Output of the above script in the AT Command Tester tool tool.
AT+cmgd=? +CMGD: (0,1,2),(0-4) OK AT+cmgd=1 OK AT+cmgd=2 OK AT+cmgd=3 OK AT+cmgd=,1 OK AT+cmgd=,2 OK AT+cmgd=,3 OK AT+cmgd=,4 OK