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I am using the GSM Shield with RFRobot backpack and I am running the program Web Client example. I have not yet set a PIN on the GSM which is for the most part in its defaulted state. I have not set a login or password either yet on the sm5100b.

  Web client
 This sketch connects to a website through a GSM shield. Specifically,
 this example downloads the URL "" and prints it
 to the Serial monitor.
 * GSM shield attached to an Arduino
 * SIM card with a data plan
 created 8 Mar 2012
 by Tom Igoe

// libraries
#include <GSM.h>

// PIN Number
#define PINNUMBER ""

// APN data
#define GPRS_APN       "att.mvno" // replace your GPRS APN
#define GPRS_LOGIN     ""    // replace with your GPRS login
#define GPRS_PASSWORD  "" // replace with your GPRS password

// initialize the library instance
GSMClient client;
GPRS gprs;
GSM gsmAccess;

// URL, path & port (for example:
char server[] = "";
char path[] = "/";
int port = 80; // port 80 is the default for HTTP

void setup()
  // initialize serial communications and wait for port to open:
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only

  Serial.println("Starting Arduino web client.");
  // connection state
  boolean notConnected = true;
  // After starting the modem with GSM.begin()
  // attach the shield to the GPRS network with the APN, login and password
    if((gsmAccess.begin(PINNUMBER)==GSM_READY) &
      notConnected = false;
      Serial.println("Not connected");


  // if you get a connection, report back via serial:
  if (client.connect(server, port))
    // Make a HTTP request:
    client.print("GET ");
    client.println(" HTTP/1.0");
    // if you didn't get a connection to the server:
    Serial.println("connection failed");

void loop()
  // if there are incoming bytes available
  // from the server, read them and print them:
  if (client.available())
    char c =;
  // if the server's disconnected, stop the client:
  if (!client.available() && !client.connected())

    // do nothing forevermore:

My SIM card is an H20 Wireless $40/Month plan that is supposed to have 400mb of data with it. Right now my serial output is coming out as "not connected". I am hoping to get the device to read some data from is all I really need to do with it right now. Thanks in advance for any help out in this regard! I am able to dial out and send SMS.

My call to at+senddata is returning

+CME ERROR: operation not supported
+CME ERROR send data failed.

What are the potential causes for this? I am following the white paper for at send data commands and manually calling the at+senddata from the terminal.
« Last Edit: March 31, 2013, 10:43:55 pm by sepy » Logged

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Reading your post it looks like you are not using the Arduino GSM/GPRS shield:

but another one.

The example and the supporting library are prepared for the Arduino shield. May that be the reason?

México; Edo. Méx.
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yeah in fact you have to obtain the respective datasheet of at command for your device and after thad modify the library on the At commands to acces to GPRS

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