c programme for arduino while connecting gsm shield

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C

Assalmoalaikum. I want to ask that iam designing my fyp based on arduino microcontroller. In that I want to switch on the motor for 15 minutes by sending sms. I am using sim 900 gsm shield and arduino mega 2560 microcontroller and I have connected my gsm shield with arduino and also a debugger(based on terminal software) to check the response in gsm shield I am using this pgm

// give it a name:

unsigned int led = 13;

void setup() 
{ 
  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);
  
  //Initialize serial and wait for port to open:
  Serial1.begin(9600);
  Serial2.begin(9600);
  Serial2.println("Hello Computer");
} 

void loop() 
{   
    //digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
    ///delay(50);               // wait for a second
    //digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
    //delay(50);               // wait for a second 
    
    // read from port 2, send to port 1:
    if (Serial2.available()) 
    {      
      //Serial2.print(inByte);
      Serial1.write(Serial2.read());  
    } 
    
    // read from port 1, send to port 2:
    if (Serial1.available()) 
    {
         Serial2.write(Serial1.read());           
    }   
} 

I am getting all the responses. Now I need the code that will make my arduino to compare my cell number and after that it would switch on the motor. After reading my sms "switch on the moter" through pwm pins of arduino.... I have been struggling for a month, please help me.