sms message

Hi all
I try to send a sms message.
if the "aData" parameter is for example "message data" then the message looks like this :
"???message data". (the question marks are upside down by the way)
I have no idea why that happens !!!
please help me figure this out ,

THANKS

void CSmsSender::SendL(const TDesC16& aAddress, const TDesC8& aData)
{
	// Create the SMS message
	CSmsBuffer* smsBuffer = CSmsBuffer::NewL();
	iSmsMsg = CSmsMessage::NewL(iFs, CSmsPDU::ESmsSubmit,smsBuffer);
         TSmsUserDataSettings smsSettings;
	smsSettings.SetAlphabet(TSmsDataCodingScheme::ESmsAlphabet7Bit);
	smsSettings.SetTextCompressed(EFalse);
	iSmsMsg->SetUserDataSettingsL(smsSettings);
	iSmsMsg->SetToFromAddressL(aAddress);
	CSmsPDU& pdu = iSmsMsg->SmsPDU();
	CSmsUserData& userData = pdu.UserData();
	userData.AddInformationElementL(CSmsInformationElement::ESmsIEIReserved,aData);
	iSocket.Close();
	// Open a socket
	User::LeaveIfError(iSocket.Open(iSocketServer, KSMSAddrFamily, KSockDatagram, KSMSDatagramProtocol));
         TSmsAddr smsAddr; // Bind to SMS port
         smsAddr.SetSmsAddrFamily(ESmsAddrSendOnly);
	iSocket.Bind(smsAddr);
	// Open a write stream on the socket and stream our message. 
	RSmsSocketWriteStream writeStream(iSocket);
	writeStream << *(iSmsMsg);
	TInt ret;
	TRAP(ret,writeStream.CommitL());
	User::LeaveIfError(ret);
	// Send the message
	iSocket.Ioctl(KIoctlSendSmsMessage, iStatus, &iOctlResult, KSolSmsProv);
	SetActive();
}