I want to make a project using an arduino and SIM900 to send a sms,but doesn't work and I want your help to figure it out,because I do not understand some things.
I asked in arduino forum,but I also ask here.
What I have tried:
SoftwareSerial mySerial(8, 7);
mySerial.println("AT+CPIN = \"7394\""); updateSerial();
mySerial.print("Hello world"); updateSerial();
AT+CPIN = "7394"
AT+CMGS="+30XXXXXXXXXX" // I don't show phone number right here
> Hello world
So,I don't receive any messages.
Also,I don't understand what is the meaning of +CREG: 2
I searched in google and I found:
2 not registered, but MT is currently searching a new operator to register to
but I don't understand what is the meaning of this.
I use Arduino Uno and here is sim900