problem GSM sending sms with character @

Official Hardware Retired GSM Shield
1

Hi,

I am using the sample from arduino website as below.

I am wondering why when sending with characters like @ $, The recipient will display other character?
How to received the exactly characters @ $ ?
Please advise.

2

Hi,

How did you send/receive SMS? Between two shields? With a smartphone to send or to receive?

Please, tell us more details.

3

Dear davidgoth,

The device i connected is arduino uno + GSM modem. I try input the @ characters with serial monitor to send it. my smart phone received the different characters.
But when i try with smart phone to send out to another smart phone, it can received perfect @ characters.

4

It could be a problem about encode/decode configuration.

Upload this sketch;

#include <SoftwareSerial.h>
#include <string.h>
 
char incoming_char = 0;
SoftwareSerial cell(2,3);
 
void setup()
{
  // Initialize serial ports for communication.
  Serial.begin(9600);
 
  // Reset
  Serial.println("Start Reset");
  pinMode(7, OUTPUT);
  digitalWrite(7, HIGH);
  delay(12000);
  digitalWrite(7, LOW);
  delay(1000);
  Serial.println("End Reset");  
 
  cell.begin(9600) ;
 
  Serial.println("Enter your AT commands (with CR & NL)...");
}
 
void loop()
{
  if(cell.available() > 0)
  {
    incoming_char = cell.read();
    if((incoming_char >= ' ') && (incoming_char<='z'))
      Se rial.print(incoming_char);
    else
    {
      Serial.print("%");
      Serial.print((int) incoming_char);
      Serial.print("%");
      if(incoming_char == 10)
        Serial.println();
    }
  }
 
  if(Serial.available() > 0)
  {
    incoming_char = Serial.read();
    cell.print(incoming_char);
  }
}

And, enter the next commands with 'Both CR/LF' configuration in Serial Monitor:
AT+CSCS?
AT+CSMP?
AT+CMGF?
AT+QSMSCODE?

Post the output responsed.