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I recently bought an LTE module SIM A7670C online when connected to my laptop with a USB-TTL adapter with a baud rate of 115200, I can communicate with the module without any issues, I can send and view SMS and also make and receive phone calls as all AT commands seem to work fine. However, when connected to an Arduino UNO to Pins 1 and 2, I see these weird characters appear on the serial monitor as a response every time I send an AT command or when I receive a call or text. I know the baud rate is correct, the connections are correct, and that the module works fine.
Here is what I receive when I type "AT," ����Q(�+'�RH� ���RJ��

Here is my program:

#include <SoftwareSerial.h>
SoftwareSerial mySerial(1, 2);
void setup() {
Serial.begin(9600);
mySerial.begin(115200);
Serial.println("started");
char msg[100];
sendATcommand("AT", msg);
Serial.println(msg);
}
void loop() {
while(Serial.available()) {
mySerial.write(Serial.read());
}
while(mySerial.available()) {
Serial.write(mySerial.read());
}
}
int sendATcommand(const char* ATcommand, char* gsmMsg) {
char *ptr = gsmMsg;
mySerial.write(ATcommand);
delay(500);
while(mySerial.available() > 0) {
*ptr = mySerial.read();
ptr++;
}
*ptr = '\0';
return ptr - gsmMsg;
}

I've tried to recreate the same circuit with a SEEED Xiao SAMD 21, but unfortunately I'm still having the same issue.

LINK: https://forum.arduino.cc/t/weird-characters-from-lte-module-a7670c/1079880

The entire process of installing CircuitPython on the SEEED XIAO ESP32-C3 board.