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Try this script included in AT Command Tester Tool.
//Script: at+cnsmod
//This AT command is applicable for SIMCOM modules only
//Check SIMCOM Module AT Command documentaiton
//Return current network system mode.
//Get the command support
AT+CNSMOD=?
//Wait
WAIT=2
//Query the current system mode
//A numerical value is returned for stat
//+CNSMOD:<n>,<stat>
// 0 - no service
//1 – GSM
//2 – GPRS
//3 – EGPRS (EDGE)
//4 – WCDMA
//5 – HSDPA only(WCDMA)
//6 – HSUPA only(WCDMA)
//7 – HSPA (HSDPA and HSUPA, WCDMA)
//8 – LTE
//9 – TDS-CDMA
//10 – TDS-HSDPA only
//11 – TDS- HSUPA only
//12 – TDS- HSPA (HSDPA and HSUPA)
//13 – CDMA 1
//4 – EVDO
//15 – HYBRID (CDMA and EVDO)
//16 – 1XLTE(CDMA and LTE)//1 – GSM
//2 – GPRS
//3 – EGPRS (EDGE)
//4 – WCDMA
//5 – HSDPA only(WCDMA)
//6 – HSUPA only(WCDMA)
//7 – HSPA (HSDPA and HSUPA, WCDMA)
//8 – LTE
//9 – TDS-CDMA
//10 – TDS-HSDPA only
//11 – TDS- HSUPA only
//12 – TDS- HSPA (HSDPA and HSUPA)
//13 – CDMA 1
//4 – EVDO
//15 – HYBRID (CDMA and EVDO)
//16 – 1XLTE(CDMA and LTE)
AT+CNSMOD?
//Wait
WAIT=2
//Enable auto report of teh network system mode
AT+CNSMOD=1
//Wait
WAIT=2
//Disable auto report of teh network system mode
AT+CNSMOD=0
Output of above script in AT Command Tester Tool.
AT+CNSMOD=?
+CNSMOD: (0-1)
OK
AT+CNSMOD?
+CNSMOD: 0,8
OK
AT+CNSMOD=1
OK
AT+CNSMOD=0
OK