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I am developing an application for GSM Modems (D-Link DWM-156) in C#.Net using AT commands. I have a problem sending Unicode messages (Such as messages written in Persian or Arabic). Here it is the core of my program: SerialPort GSMPort = new SerialPort(); GSMPort.PortName = "COM6"; GSMPort.BaudRate = 9600; GSMPort.Parity = Parity.None; GSMPort.DataBits = 8; GSMPort.StopBits = StopBits.One; GSMPort.Handshake = HandShake.RequestToSend; GSMPort.DtrEnable = true; GSMPort.RtsEnable = true; GSMPort.Open(); GSMPort.Write("AT\r"); Thread.Sleep(1000); GSMPort.Write("AT+CMGF=1\r"); Thread.Sleep(1000); GSMPort.Write("AT+CMGS=\"" + destinationNumber + "\"\r\n"); Thread.Sleep(1000); GSMPort.Write(shortMessage+ "\x1A"); It works fine for English and ASCII letters. I have read this article and can send Unicode messages in Hyperterminal using AT commands: AT [Enter] OK AT+CSCS="UCS2" or AT+CSCS="HEX" [Enter] ---> We have to convert our message to hex OK AT+CMGF=1 [Enter] OK AT+CMGS="destinationNumber" [Enter] > 0633064406270645002006450631062D06280627 ---> The hex format of our message (سلام مرحبا) +CMGS: 139 OK Since this commands worked correctly, I have added GSMPort.Write("AT+CSCS=\"UCS2\"\r"); to my application, and tried to send 0645 0631 062D 0628 0627 (مرحبا) or 0633 0644 0627 0645 (سلام). GSMPort.Write("AT\r"); Thread.Sleep(1000); GSMPort.Write("AT+CSCS=\"UCS2\"\r"); Thread.Sleep(1000); GSMPort.Write("AT+CMGF=1\r"); Thread.Sleep(1000); GSMPort.Write("AT+CMGS=\"" + destinationNumber + "\"\r\n"); Thread.Sleep(1000); GSMPort.Write("0633064406270645" + "\x1A"); But unlike AT commands in Hyperterminal, destination does not receive correct letters. What is the difference between these AT commands in C# code and Hyperterminal code? I

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