ok so im using sim module 900 with arduino mega..so i got this code that will send the messages out to phone but when i try to send a msg from phone to the sim module i dont receive it could you please help?
thanks!
gsm.txt (1.54 KB)
Describe your set up, connections from which pins to which pins, power supply ( make sur you have 2A available to power your 900), do you see lights blinking etc ...