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Test AT+CNAOP command with AT Command Tester
Try this script included in AT Command Tester Tool.
//Script: at+cnbp
//This AT command is applicable for SIMCOM modules only
//Check SIMCOM Module AT Command documentaiton
//Acquisition order preference
?
//Get the current order preference
AT+CNAOP?
//Set the preferred band
//mode = 7
//sys_mode
// 2 - CDMA
// 3 - GSM
//4 - HDR
//5 - WCDMA
//9 - LTE
//11 - TDSCDMA
AT+CNAOP=7,9,5,3,11,2,4
//Wait
WAIT=2
Output of above script in AT Command Tester Tool.
AT+CNAOP?
+CNAOP: 7,9,5,3,2,4
OK
AT+CNAOP=7,9,5,3,11,2,4
OK
AT+CNAOP?
+CNAOP: 7,9,5,3,2,4
OK