Initially I got confused between V1 and V2 and used a 4.4 supply for this one. Though it did work it kept resetting after a few seconds. Then i read somewhere that the two parallel diodes on the module should reduce the input voltage so I must use 7V at 2A.
It worked like magic.
I was able to make calls and I got so excited looking at the delay in the Net led (meaning network has been registered).
I tried using the sim on my GSM SIM800L V1 (the red chip) and initially it worked. But all of a sudden, I don't know what happened but the voltage dropped suddenly and chip started overheating. I kept this one at 5V initially.
I thought the sim was broken so I tried calling to someone on my phone using it and it worked. No issues with the sim.
Now when I put back the sim into the V2, I see that the network has been registered but it's not responding to any AT commands or is it making any calls. I tried switching the Tx and Rx in case I made a mismatch but no.
Been stuck with this project for months and when I start to see light at the end of the tunnel it suddenly closed again.
Link to video : [Reddit - Dive into anything]