Help in testing an old phone AT commands through serial monitor

Please help, I want to use my old china button phone as a gsm module, to test if it can accept AT command through the serial monitor i connected my old button phone to rx-tx and tx-rx of arduino ,and i change the serial pins as well but i was getting garbage output to the serial monitor i have tried to change the baud rate but still getting same results here is the code:

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2,3);

void setup()
{
mySerial.begin(19200);
Serial.begin(19200);
}

void loop()
{
if (mySerial.available())
Serial.write(mySerial.read());
if (Serial.available())
mySerial.write(Serial.read());

}

Did you change the baud rate in serial monitor?

Yes i change the baud rate of the serial monitor to match the baud rate i put in the code

i connected my old button phone to rx-tx and tx-rx of arduino

I assume that the 'phone actually has a serial interface. That sounds unusual

Yeah it has an rx and tx pins on it circuitry

Ngalande:
Yeah it has an rx and tx pins on it circuitry

That's interesting. What make/model of 'phone is it ?

Its itel keypad phone
Model-it5600

I can't find any reference to a serial interface in the specifications for that 'phone that I have found. Can you please supply a reference ?

This picture shows the Rx and TX point on the phone

https://www.imei.info/phonedatabase/84080-itel-it5600/&ved=2ahUKEwik-oWvxaHmAhVIhOAKHTxtB9gQFjAMegQIBhAB&usg=AOvVaw3dcpSpgc1OsSSJBaI3ATvg


Posting images
How to post an image.
Another page on posting images.

https://www.imei.info/phonedatabase/84080-itel-it5600/&ved=2ahUKEwik-oWvxaHmAhVIhOAKHTxtB9gQFjAMegQIBhAB&usg=AOvVaw3dcpSpgc1OsSSJBaI3ATvg

404 page not found error for me.

Try this one iTel IT5600 Specs, Price and Review | DroidAfrica

I can see no reference to a serial interface on that site