Quote Originally Posted by EarlyBird2 View Post
Have you set new message notification? It is not in your code.
Hello Bird,

Yes, there is a pin on sim900 GSM modem, if a new message be received this pin will be in high state less than 1 second, I use this pin for the new message notification. But i didn't use this feature in this sample routine. Because I am still busy with comparing two things with each other... the question of this thread is still valid

Thank you