I’m trying to interface SIM900a A6 module like the one shown in the link below with Arduino Leonardo. Based on the blinking status of the onboard LEDs of the SIM module (blinks continuously every 3s), the sim should be connected to the network. However, when I call the SIM number inserted in the module I don’t hear a ring back. It also doesn’t respond to AT commands.
I’m connecting it to 5V from Arduino board. Rx to pin#2 and Tx to pin#3.
Kindly help me understand why it’s not working!! Thank you