I tried to use GSM900A mini module with Arduino UNO with Software Serial and Serial and also used Serial to USB converter also but still I did not get any response from it.
This is my video of Signal LED blink and connection. https://youtu.be/r5NGoSUxb8E
This Photo Shows communication pins with Arduino UNO.
I am from Sri Lanka and I used Sri Lankan Sim cards. GSM Module: SIM900A Mini v3.4 IMEI : 864161026832936.
Lastly I Tried Your Video also but I did not get any call.
Please help me to sole this problem. How to test is from beginning?