Hi I am trying to use sim900 shield with my arduino. The first and main problem i am facing is that it is not coumunicating with my ardiuno. i tried Arduino uno mega due none of them are working same problem exits with each ardiuno. i tried software serial on mega and hardware serial on due still the same problem ardiuno is not coumunicating even i typed AT i dont get a response "ok" none of them are working i tired many tutorials and example even the simple example is not working mentioned in this link.[In-Depth: Send Receive SMS & Call with SIM900 GSM Shield & Arduino]
I used the simple tutorial and the simple code mentioned in this link but its not handshaking
Can any one please help me out with this issue i am so fed up now. GSM shield is power on green light is blinking every 3 second means network is found but when i type AT it does not respond.
I am uploading a picture of my project
thankyou in advance``