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Try the below script in the AT Command Tester tool
//Script: at_csca.at //Use this script to AT+CSCA AT command //Get the command support AT+CSCA=? WAIT=2 //Get the current SMS Service Center address AT+CSCA? WAIT=1 //Set the SMS Service Center Address AT+CSCA="+19703769800"
Output of the above script in the AT Command Tester tool
tool.
//Script: at_csca.at //Use this script to AT+CSCA AT command //Get the command support AT+CSCA=? WAIT=2 //Get the current SMS Service Center address AT+CSCA? WAIT=1 //Set the SMS Service Center Address AT+CSCA="+19703769800"