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Try the below script in the AT Command Tester tool
//Script: at_cgsms.at //Use this script to AT+CGSMS AT command //Get the command support AT+CGSMS=? WAIT=2 // Get the supported services //0 = GPRS //1 - Circuit switched //2 - GPRS Preferred //3 - Circuit switch preferred AT+CGSMS? WAIT=1 // Set MO SMS service preference to GPRS preferred AT+CGSMS=2 // Set MO SMS service preference to circuit switch preferred //the network. Accepted only in PDU mode. AT+CGSMS=3
Output of the above script in the AT Command Tester tool
tool.
AT+CGSMS=? +CGSMS: (0-3) OK AT+CGSMS? +CGSMS: 3 OK AT+CGSMS=2 OK AT+CGSMS=3 OK