I tried a SIM900A module some time ago and faced the same problem - only garbage in return on the serial interface. Tried different baud rates, stop bits etc. I gave up and archived the module in the garbage bin.
Where did you buy it?
I tried a SIM900A module some time ago and faced the same problem - only garbage in return on the serial interface. Tried different baud rates, stop bits etc. I gave up and archived the module in the garbage bin.
Where did you buy it?