Hello, 
I am building an alarm system with an SIM900 shield and arduino UNO. I programmed it to call me when a movement is detected and it works. So now, I would like it to read numbers that I type after have picked the call up.
Do you know when you call customer services and they tell you "type 1 in this case", "type 2 to go to menu" ecc... I would like to type 1 to turn the alarm off if I am at home and I know it turned on by mistake.
I looked up some library references and stuff but I did not find any useful command...and AT commands are Chinese to me...
How can I (Arduino) read numbers the caller types while calling?
Thank you very much!