INTERFACING GSM SIM 900 WITH LEONARDO.

Projects General Guidance
5
  1. Which SIM900 based device are you using?
  2. Have you confirmed that said device is functioning? If not, and it is the common shield, go here and follow the instructions to check it using Serial Relay
  3. Is the SIM card activated? Can you send a text / sms from a 'phone?
  4. Post ALL your code using the code (#) tags.