Sim800L cannot access network to arduino

Good Day. Im having problem with my project. I use arduino Uno and Sim800L module


But it doesnt seems working. I tried to call my sim card. But it cannot access any network. My sim card is cannot be reached. Also I tried sending message however its not working

My connections are ;

  • | ARDUINO UNO >>> SIM800L |

  •     GND                  >>>   GND
  •    RX  10                >>>   TX    
  •    TX  11                 >>>   RX
  •   RESET 2              >>>   RST 


#include <Sim800L.h>
#include <SoftwareSerial.h>
Sim800L Sim800L;
char* text;
char* number;
bool error;

void setup(){
text=“Testing Sms”;


void loop(){


If your SIM is not reachable then you need to check these things,

  • Is GSM module powered on properly with a 4V 2A input on VBAT pin.
  • Is NETLIGHT LED blinking and at what rate?
  • If NETLIGHT is not blinking then you might not turned it on properly, Did you press the PWRKEY down for 1 second?

Also, did you go through this post to find possible reasons?

Hello. I can’t see the antenna, maybe you need to soldering it.

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Good observation @ALEXIS.
@potpot Is the spring lying on the table is the antenna?


RaviPujar and Alexis, thank you very much for your response to my question :slight_smile:.
I had fixed it I fixed the antenna to my gsm module. Thank you again for the help :slight_smile:

Glad you were able to fix it :slight_smile:

You are welcome))):grinning:

1 Like