Problem for connecting Sparkfun SM5100B-D with arduino

Projects Networking, Protocols, and Devices
1

Hi, i have a problem for connecting my Sparkfun SM5100B-D with arduino, i connected both boards like i show in the next pictures, i just want to send a SMS, i hope you can help me.






Also, i am using this code:

#include <SoftwareSerial.h> //Libreria para permitir comunicacion serial en otros pines

SoftwareSerial cell(2,3); // Puerto serie para comunicacion con el modulo GSM
unsigned char CR=13; // caracter de retorno de linea

void setup()
{

cell.begin(9600); // Iniciamos el cellular shield
delay(35000); // Delay de 35 segundos para inicializacion del modulo GSM
cell.println("AT+CMGF=1");// Preparamos el modulo GSM para envio de SMS

}
void loop()
{
// Numero de telefono entre comillas AT+CMGS="Numero"
delay(1500);
cell.write("AT+CMGS="4271157958"");//comando at para introducir el num
cell.write(CR);
delay(1500);
cell.write("Prueba1 exitosa");//texto del SMS
cell.write(CR);
delay(500);
cell.write(0x1A); // ASCII equivalente al Ctrl-Z, final de SMS
delay(15000); // Tiempo de "descanso" del modulo
while(true)
delay(1); // Bucle infinito para no enviar infinitos SMS.
}

Could you help me to solve this problem, please?

2

I have no experience of this product, but don't you need the recipients number to be in international format? I.e. +447751123456