#include <SoftwareSerial.h>
 
 
SoftwareSerial gprsSerial(10,11);
 
void setup()
{
  gprsSerial.begin(19200); // GPRS shield baud rate 
  Serial.begin(19200);   
  delay(500);
}
 
void loop()
{
 
  if (Serial.available()) // if there is incoming serial data
   switch(Serial.read()) // read the character
   {
     case 't': // if the character is 't'
       SendTextMessage(); // send the text message
       break;
     case 'd': // if the character is 'd'
       DialVoiceCall(); // dial a number
       break;
 
   } 
 
  if (gprsSerial.available()){ // if the shield has something to say
    Serial.write(gprsSerial.read()); // display the output of the shield
  }
}
 
/*
* Name: SendTextMessage
* Description: Send a text message to a number
*/
void SendTextMessage()
{
  Serial.println("Sending Text...");
  gprsSerial.print("AT+CMGF=1\r"); // Set the shield to SMS mode
  delay(100);
  // send sms message, the phone number needs to include the country code e.g. if a U.S. phone number such as (540) 898-5543 then the string must be:
  // +15408985543
  gprsSerial.println("AT+CMGS = \"+27829729702\"");
  delay(100);
  gprsSerial.println("How are you today?"); //the content of the message
  delay(100);
  gprsSerial.print((char)26);//the ASCII code of the ctrl+z is 26 (required according to the datasheet)
  delay(100);
  gprsSerial.println();
  Serial.println("Text Sent.");
}
 
/*
* Name: DialVoiceCall()
* Description: Can call/dial a phone number
*/
void DialVoiceCall()
{
  gprsSerial.println("ATD+27829729702");//dial the number, must include country code
  delay(100);
  gprsSerial.println();
}