I recently bought the sim900 gsm module: http://www.ebay.co.uk/itm/GSM-GPRS-Shield-For-Arduino-/230911052682?pt=LH_DefaultDomain_0&hash=item35c35f0b8a
I have been working this gsm library https://code.google.com/p/gsm-shield-arduino/downloads/list
using the arduino uno from this supply :https://www.dipmicro.com/store/BTE-RCB2011
I have configured every thing the right way and now trying the sms example. The serial
output says message sent but the message is not recieved by the phone. Hope you can help.
//If not used, is better to exclude the HTTP library,
//for RAM saving.
//If your sketch reboots itself proprably you have finished,
//your memory available.
//If you want to use the Arduino functions to manage SMS, uncomment the lines below.
//To change pins for Software Serial, use the two lines in GSM.cpp.
//GSM Shield for Arduino
//this code is based on the example of Arduino Labs.
//Simple sketch to send and receive SMS.
Serial.println("GSM Shield testing.");
//Start configuration of shield with baudrate.
//For http uses is raccomanded to use 4800 or slower.
//Enable this two lines if you want to send an SMS.
if (sms.SendSMS("+444538590489", "Arduino SMS"))
Serial.println("\nSMS sent OK");
//Read if there are messages on SIM card and print them.
if(gsm.readSMS(smsbuffer, 160, n, 20))