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31  Products / Arduino GSM Shield / Re: GSM shield not working with tmobile SIM on: January 16, 2014, 02:57:08 am
The network is rejecting your SIM. Check PIN and APN. Contact with your operator.
32  Products / Arduino GSM Shield / Re: Sketch not working after disconnect/connect power on: January 16, 2014, 02:54:04 am
Check if your issue happens with the examples included with Arduino IDE (GSM).
33  Products / Arduino GSM Shield / Re: Debug mode of example/GSMScanNetworks not working on: January 16, 2014, 02:29:30 am
Without debug mode, does GSMScanNetworks works properly?
34  Products / Arduino GSM Shield / Re: Adding 1602 display to Gsm SHield+Arduino Uno rev3 on: January 02, 2014, 02:54:40 am
You cannot use pin 3. Pin 3 is used by GSM shield to receive information from Arduino board.
35  Products / Arduino GSM Shield / Re: Original Arduino GSM Library - change RX / TX to Hardware Serial on: January 02, 2014, 02:51:16 am
You can modify it. The most important things are software serial communication, commands compatibility, software flow control and responses times.
36  Products / Arduino GSM Shield / Re: Arduino Uno + GSM Shield, Band Management on: December 20, 2013, 03:08:45 am
You must use a configuration that includes E-GSM(900) and DCS(1800) bands, although includes other bands.
The GSM Shield doesn't work with 3G.
37  Products / Arduino GSM Shield / Re: gsm shield on: December 17, 2013, 02:45:11 am
SMS service is only available between BlueVia SIMs.
38  Products / Arduino GSM Shield / Re: GSM SHIELD suddenly stopped working on: December 09, 2013, 03:09:37 am

Upload a example like GSMWebClient, change the line "GSM gsmAccess;" to "GSM gsmAccess(true);" to activate debug mode and post serial monitor output.
39  Products / Arduino GSM Shield / Re: Arduino GSM Shields works with all the boards or it needs a paticular one? on: December 05, 2013, 06:57:13 am

GSM Shield works with Arduino UNO, Arduino Mega ADK and Arduino Leonardo. Mega ADK and Leonardo requires some little modifications. To support a SD card, you have to get something like this:, provided that the pins, that are used by GSM Shield, aren't used by SD board. These pins are digitals 2 and 3.
40  Products / Arduino GSM Shield / Re: GSM Library and atmega8 on: December 05, 2013, 06:34:35 am

ATMega8 has too differences in comparison with ATMega328/168. Arduino Core files dedicated to mapping ports are differents. Because of this, GSM library requires a special adaptation to ATMega8 ports and registers.
41  Products / Arduino GSM Shield / Re: w/o voice circuit, will the GSM shield & Arduino on: November 20, 2013, 02:34:42 am
The modem itself does not produce a ringtone, but it is possible via modem AOUT2 output. See the manual for more information M10 (Audio Interfaces section):

42  Products / Arduino GSM Shield / Re: grps.GetIPAddress returns ip of on: November 13, 2013, 03:50:57 am
There is an error in your code with connection while.

I fixed for you:

  Basic Web Server

 A simple web server that replies with nothing, but prints the client's request
 and the server IP address.

 * GSM shield attached

 by David Cuartielles
 modified 21 Nov 2012
 by Tom Igoe

 This example code is part of the public domain
 #include <GSM.h>

// PIN Number
#define PINNUMBER ""

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

// initialize the library instance
GPRS gprs;
GSM gsmAccess;     // include a 'true' parameter for debug enabled
GSMServer server(80); // port 80 (http default)

// timeout
const unsigned long __TIMEOUT__ = 10*1000;

void setup()
  // initialize serial communications
  // connection state
  boolean notconnected = true;

  // Start GSM shield
  // If your SIM has PIN, pass it as a parameter of begin() in quotes
    if((gsmAccess.begin(PINNUMBER)==GSM_READY) &
      notconnected = false;
      Serial.println("Not connected");

  Serial.println("Connected to GPRS network");

  // start server

  //Get IP.
  IPAddress LocalIP = gprs.getIPAddress();
  Serial.println("Server IP address=");

void loop(){
  GSMClient client = server.available();

 if (client) {
   if (client.available()) {

43  Products / Arduino GSM Shield / Re: Automated responses to voice calls with the GSM shield? on: November 13, 2013, 03:25:14 am
Integration between Cantarino and any modem doesn't exist currently. You can do some tests connecting microphone input of GSM Shield to some input according to Cantarino.
44  Products / Arduino GSM Shield / Re: compatibility issues with AT&T or T-mobile sim card on: October 31, 2013, 03:07:47 am
Arduino GSM Shield is compatible only with GSM operators. Not CDMA, UMTS and other types.
45  Products / Arduino GSM Shield / Re: problem with gsm on: October 15, 2013, 01:18:14 am

A 0,3 response in CGREG command means network is refusing your SIM card. Did you written APN correctly?. Contact with your mobile operator.
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