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diff --git a/libraries/GSM/GSM3ShieldV1ModemVerification.cpp b/libraries/GSM/GSM3ShieldV1ModemVerification.cpp
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+++ b/libraries/GSM/GSM3ShieldV1ModemVerification.cpp
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+/*
+This file is part of the GSM3 communications library for Arduino
+-- Multi-transport communications platform
+-- Fully asynchronous
+-- Includes code for the Arduino-Telefonica GSM/GPRS Shield V1
+-- Voice calls
+-- SMS
+-- TCP/IP connections
+-- HTTP basic clients
+
+This library has been developed by Telefónica Digital - PDI -
+- Physical Internet Lab, as part as its collaboration with
+Arduino and the Open Hardware Community. 
+
+September-December 2012
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+The latest version of this library can always be found at
+https://github.com/BlueVia/Official-Arduino
+*/
+
+#include <GSM3ShieldV1ModemVerification.h>
+
+// constructor
+GSM3ShieldV1ModemVerification::GSM3ShieldV1ModemVerification()
+{
+};
+
+// reset the modem for direct access
+int GSM3ShieldV1ModemVerification::begin()
+{
+	int result=0;
+	String modemResponse;
+	
+	// check modem response
+	modemAccess.begin();
+
+	// reset hardware
+	modemAccess.restartModem();
+
+	modemResponse=modemAccess.writeModemCommand("AT", 1000);
+	if(modemResponse.indexOf("OK")>=0)
+		result=1;
+	modemResponse=modemAccess.writeModemCommand("ATE0", 1000);
+	return result;
+}
+
+// get IMEI
+String GSM3ShieldV1ModemVerification::getIMEI()
+{
+	String number;
+	// AT command for obtain IMEI
+	String modemResponse = modemAccess.writeModemCommand("AT+GSN", 2000);
+	// Parse and check response
+	char res_to_compare[modemResponse.length()];
+	modemResponse.toCharArray(res_to_compare, modemResponse.length());
+	if(strstr(res_to_compare,"OK") == NULL)
+	{	
+		return NULL;
+	}
+	else
+	{
+		number = modemResponse.substring(1, 17);
+		return number;
+	}
+}