GSM module SIM900A not working - AT Commands not responding, No network


#1

Haiii I am using the gsm 900A but it is not working properly its status signal blinking continuously and it is not responding for AT commands pls I need ur help


#2

Please ensure that it has the recommended voltage,
Try swapping rx and tx wires and try different baud rates with each swap


#3

Try what Peter said,
First things to check are your module is getting 4V 2A .
next check antenna connection.
Go through this post and see if it helps,


#4

I had same issue. In my case, I was using micro sim & i was unable to install it properly on Sim900A. Try full Sim or adapter to connect it to gsm module.


#5

SIM900A is blocked to telecom providers in Asia countries listed as follow, so try to get a SIM900 module which has a wider bandwidth coverage around the world.
China
India
Singapore
Malaysia
Thailand
Indonesia
Cambodia
Vietnam
Laos
Burma
Brunei
Philippines
East Timor


#6

Hi i have gsm900shiled in some times i do not respond to commands and i dont know where the bugs are but the bugs are not the source of power and have a solution thank you