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1. Make sure the RX of your arduino board is connected to TX of GSM and the TX should be connected in RX of GSM module.
2. Next try to do this

GPRS.begin(9600);
Serial.begin(115200);

1. Also double check your wirings, if you have a tester you might wanna check if both end are connected with each other. And in the loop try to print this Serial.println(GPRS.available()) if it is not greater than 0 then you have a problem with your connection.

   #include <SoftwareSerial.h> SoftwareSerial sim(2,3);

   void setup() { // put your setup code here, to run once: Serial.begin(115200); sim.begin(9600); }

   void loop() { // put your main code here, to run repeatedly: while(Serial.available() > 0){ sim.write(Serial.read()); }

   while(sim.available() > 0){ Serial.write(sim.read()); } }

diagram reference.

Hope this help.

1. Make sure the RX of your arduino board is connected to TX of GSM and the TX should be connected in RX of GSM module.
2. Next try to do this

   GPRS.begin(9600);  
   Serial.begin(115200);

3. Also double check your wirings, if you have a tester you might wanna check if both end are connected with each other. And in the loop try to print this Serial.println(GPRS.available()) if it is not greater than 0 then you have a problem with your connection.

    #include <SoftwareSerial.h>
    SoftwareSerial sim(2,3); 
    
    void setup() {
      // put your setup code here, to run once:
      Serial.begin(115200);
      sim.begin(9600);
    }
    
    void loop() {
      // put your main code here, to run repeatedly:
      while(Serial.available() > 0){
        sim.write(Serial.read());
      }
    
      while(sim.available() > 0){
        Serial.write(sim.read());
      }
    }

diagram reference.

Hope this help.

1. Make sure the RX of your arduino board is connected to TX of GSM and the TX should be connected in RX of GSM module.
2. Next try to do this

GPRS.begin(9600);
Serial.begin(115200);

1. Also double check your wirings, if you have a tester you might wanna check if both end are connected with each other. And in the loop try to print this Serial.println(GPRS.available()) if it is not greater than 0 then you have a problem with your connection.

   #include <SoftwareSerial.h> SoftwareSerial sim(2,3);

   void setup() { // put your setup code here, to run once: Serial.begin(115200); sim.begin(9600); }

   void loop() { // put your main code here, to run repeatedly: while(Serial.available() > 0){ sim.write(Serial.read()); }

   while(sim.available() > 0){ Serial.write(sim.read()); } }

Follow this link also for the diagram reference. https://imageup.me/images/a49982fe-c592-44d7-b696-ed80e725fec5.png

Hope this help.

1. Make sure the RX of your arduino board is connected to TX of GSM and the TX should be connected in RX of GSM module.
2. Next try to do this

GPRS.begin(9600);
Serial.begin(115200);

1. Also double check your wirings, if you have a tester you might wanna check if both end are connected with each other. And in the loop try to print this Serial.println(GPRS.available()) if it is not greater than 0 then you have a problem with your connection.

   #include <SoftwareSerial.h> SoftwareSerial sim(2,3);

   void setup() { // put your setup code here, to run once: Serial.begin(115200); sim.begin(9600); }

   void loop() { // put your main code here, to run repeatedly: while(Serial.available() > 0){ sim.write(Serial.read()); }

   while(sim.available() > 0){ Serial.write(sim.read()); } }

diagram reference.

Hope this help.

1. Make sure the RX of your arduino board is connected to TX of GSM and the TX should be connected in RX of GSM module.
2. Next try to do this

GPRS.begin(9600);
Serial.begin(115200);

1. Also double check your wirings, if you have a tester you might wanna check if both end are connected with each other. And in the loop try to print this Serial.println(GPRS.available()) if it is not greater than 0 then you have a problem with your connection.

   #include <SoftwareSerial.h>
   

   SoftwareSerial sim(2,3);

   void setup() { // put your setup code here, to run once: Serial.begin(115200); sim.begin(9600); }

   void loop() { // put your main code here, to run repeatedly: while(Serial.available() > 0){ sim.write(Serial.read()); }

   while(sim.available() > 0){ Serial.write(sim.read()); } }

1. Make sure the RX of your arduino board is connected to TX of GSM and the TX should be connected in RX of GSM module.
2. Next try to do this

GPRS.begin(9600);
Serial.begin(115200);

1. Also double check your wirings, if you have a tester you might wanna check if both end are connected with each other. And in the loop try to print this Serial.println(GPRS.available()) if it is not greater than 0 then you have a problem with your connection.

   #include <SoftwareSerial.h> SoftwareSerial sim(2,3);

   void setup() { // put your setup code here, to run once: Serial.begin(115200); sim.begin(9600); }

   void loop() { // put your main code here, to run repeatedly: while(Serial.available() > 0){ sim.write(Serial.read()); }

   while(sim.available() > 0){ Serial.write(sim.read()); } }

Follow this link also for the diagram reference. https://imageup.me/images/a49982fe-c592-44d7-b696-ed80e725fec5.png

Hope this help.