Sim800l module not responding

GSM/GPRS Modules
#1

I have brought a new sim800l module as my previous one broke with a pin.
But all the modules i have…are giving me CREG=0,0 or CREG=0,2
I thought its a power problem…
but for i have my working code with MQTT and Sim800 l earlier with same arduino uno kit…

how to resolve this?

#2

Make sure you are putting the same 2G SIM card as earlier. JIO wont work as its 4G.
Check antenna and the power. You need 4V @2A