SIM900 AT来电显示开启，一些代码

/*Note: this code is a demo for how to using gprs shield to send sms message, dial a voice call and
  send a http request to the website, upload data to pachube.com by TCP connection,

  The microcontrollers Digital Pin 7 and hence allow unhindered
  communication with GPRS Shield using SoftSerial Library.
  IDE: Arduino 1.0 or later
  Replace the following items in the code:
  1.Phone number, don‘t forget add the country code
  2.Replace the Access Point Name
  3. Replace the Pachube API Key with your personal ones assigned
  to your account at cosm.com
  */

#include <SoftwareSerial.h>
#include <String.h>

SoftwareSerial mySerial(7, 8);

void setup()
{
  mySerial.begin(19200);               // the GPRS baud rate
  Serial.begin(19200);    // the GPRS baud rate
  delay(500);
}

void loop()
{
  //after start up the program, you can using terminal to connect the serial of gprs shield,
  //if you input ‘t‘ in the terminal, the program will execute SendTextMessage(), it will show how to send a sms message,
  //if input ‘d‘ in the terminal, it will execute DialVoiceCall(), etc.

  if (Serial.available())
    switch(Serial.read())
   {
     case ‘t‘:
       SendTextMessage();
       break;
     case ‘d‘:
       DialVoiceCall();
       break;
     case ‘h‘:
       SubmitHttpRequest();
       break;
     case ‘s‘:
       Send2Pachube();
       break;
   }
  if (mySerial.available())
    Serial.write(mySerial.read());
}

///SendTextMessage()
///this function is to send a sms message
void SendTextMessage()
{
  mySerial.print("AT+CMGF=1\r");    //Because we want to send the SMS in text mode
  delay(100);
  mySerial.println("AT + CMGS = \"+8613616761237\"");//send sms message, be careful need to add a country code before the cellphone number
  delay(100);
  mySerial.println("A test message!");//the content of the message
  delay(100);
  mySerial.println((char)26);//the ASCII code of the ctrl+z is 26
  delay(100);
  mySerial.println();
}

///DialVoiceCall
///this function is to dial a voice call
void DialVoiceCall()
{
  mySerial.println("ATD+8613616761237;");//dial the number
  delay(100);
  mySerial.println();
}

///SubmitHttpRequest()
///this function is submit a http request
///attention:the time of delay is very important, it must be set enough
void SubmitHttpRequest()
{
  mySerial.println("AT+CSQ");
  delay(100);

  ShowSerialData();// this code is to show the data from gprs shield, in order to easily see the process of how the gprs shield submit a http request, and the following is for this purpose too.

  mySerial.println("AT+CGATT?");
  delay(100);

  ShowSerialData();

  mySerial.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");//setting the SAPBR, the connection type is using gprs
  delay(1000);

  ShowSerialData();

  mySerial.println("AT+SAPBR=3,1,\"APN\",\"CMNET\"");//setting the APN, the second need you fill in your local apn server
  delay(4000);

  ShowSerialData();

  mySerial.println("AT+SAPBR=1,1");//setting the SAPBR, for detail you can refer to the AT command mamual
  delay(2000);

  ShowSerialData();

  mySerial.println("AT+HTTPINIT"); //init the HTTP request

  delay(2000);
  ShowSerialData();

  mySerial.println("AT+HTTPPARA=\"URL\",\"http://122.226.151.4:6543/DHT11data.ashx?c=20.1&h=45.5\"");// setting the httppara, the second parameter is the website you want to access
  delay(1000);

  ShowSerialData();

  mySerial.println("AT+HTTPACTION=0");//submit the request
  delay(10000);//the delay is very important, the delay time is base on the return from the website, if the return datas are very large, the time required longer.
  //while(!mySerial.available());

  ShowSerialData();

  mySerial.println("AT+HTTPREAD");// read the data from the website you access
  delay(300);

  ShowSerialData();

  mySerial.println("");
  delay(100);
}

///send2Pachube()///
///this function is to send the sensor data to the pachube, you can see the new value in the pachube after execute this function///
void Send2Pachube()
{
  mySerial.println("AT+CGATT?");
  delay(1000);

  ShowSerialData();

  mySerial.println("AT+CSTT=\"CMNET\"");//start task and setting the APN,
  delay(1000);

  ShowSerialData();

  mySerial.println("AT+CIICR");//bring up wireless connection
  delay(3000);

  ShowSerialData();

  mySerial.println("AT+CIFSR");//get local IP adress
  delay(2000);

  ShowSerialData();

  mySerial.println("AT+CIPSPRT=0");
  delay(3000);

  ShowSerialData();

  mySerial.println("AT+CIPSTART=\"tcp\",\"api.cosm.com\",\"8081\"");//start up the connection
  delay(2000);

  ShowSerialData();

  mySerial.println("AT+CIPSEND");//begin send data to remote server
  delay(4000);
  ShowSerialData();
  String humidity = "1031";//these 4 line code are imitate the real sensor data, because the demo did‘t add other sensor, so using 4 string variable to replace.
  String moisture = "1242";//you can replace these four variable to the real sensor data in your project
  String temperature = "30";//
  String barometer = "60.56";//
  mySerial.print("{\"method\": \"put\",\"resource\": \"/feeds/42742/\",\"params\"");//here is the feed you apply from pachube
  delay(500);
  ShowSerialData();
  mySerial.print(": {},\"headers\": {\"X-PachubeApiKey\":");//in here, you should replace your pachubeapikey
  delay(500);
  ShowSerialData();
  mySerial.print(" \"_cXwr5LE8qW4a296O-cDwOUvfddFer5pGmaRigPsiO0");//pachubeapikey
  delay(500);
  ShowSerialData();
  mySerial.print("jEB9OjK-W6vej56j9ItaSlIac-hgbQjxExuveD95yc8BttXc");//pachubeapikey
  delay(500);
  ShowSerialData();
  mySerial.print("Z7_seZqLVjeCOmNbEXUva45t6FL8AxOcuNSsQS\"},\"body\":");
  delay(500);
  ShowSerialData();
  mySerial.print(" {\"version\": \"1.0.0\",\"datastreams\": ");
  delay(500);
  ShowSerialData();
  mySerial.println("[{\"id\": \"01\",\"current_value\": \"" + barometer + "\"},");
  delay(500);
  ShowSerialData();
  mySerial.println("{\"id\": \"02\",\"current_value\": \"" + humidity + "\"},");
  delay(500);
  ShowSerialData();
  mySerial.println("{\"id\": \"03\",\"current_value\": \"" + moisture + "\"},");
  delay(500);
  ShowSerialData();
  mySerial.println("{\"id\": \"04\",\"current_value\": \"" + temperature + "\"}]},\"token\": \"lee\"}");

  delay(500);
  ShowSerialData();

  mySerial.println((char)26);//sending
  delay(5000);//waitting for reply, important! the time is base on the condition of internet
  mySerial.println();

  ShowSerialData();

  mySerial.println("AT+CIPCLOSE");//close the connection
  delay(100);
  ShowSerialData();
}

void ShowSerialData()
{
  while(mySerial.available()!=0)
    Serial.write(mySerial.read());
}

发送：AT+COLP=1，设置被叫号码显示

参考:
http://www.51hei.com/bbs/dpj-30516-1.html
http://www.seeedstudio.com/wiki/GPRS_Shield_V1.0