From Forum Nokia Wiki

Using the following code an SMS can be created in the local Inbox. The user gets a new message with the SMS alert tone (if profile not silent). SMS does not use network services ,its just created locally.

void CMobloggerPhotoEngine::SMS2Inbox()
{
	iSendingSms=ETrue;
	TBuf<10> aAddress(_L("Nokia"));
	TBuf<20> aDescription(_L("Important Message"));
 
	_LIT(KTxt1,"Hi phone owner, how r u?");
 
	TBuf<150> iMessage;	
	iMessage.Copy(KTxt1);
 
	iMtmRegistry = CClientMtmRegistry::NewL(*iSession);
  	iSmsMtm = STATIC_CAST( CSmsClientMtm*,  iMtmRegistry->NewMtmL(KUidMsgTypeSMS));
 
  	iSmsMtm->SwitchCurrentEntryL(KMsvGlobalInBoxIndexEntryId); //inbox
 
  	iSmsMtm->CreateMessageL(KUidMsgTypeSMS.iUid);
 
  	CSmsHeader& iHeader = iSmsMtm->SmsHeader();
  	iHeader.SetFromAddressL(aAddress);
 
 
  	CRichText& body = iSmsMtm->Body();
  	body.Reset();
  	body.InsertL(0, iMessage);
 
  	TMsvEntry entry = iSmsMtm->Entry().Entry();
  	entry.SetInPreparation(EFalse);
  	entry.SetVisible(ETrue);
  	entry.iDate.HomeTime();
  	entry.iDescription.Set(aDescription);
  	entry.iDetails.Set(aAddress);
  	entry.SetUnread(ETrue);
 
 
  	iSmsMtm->Entry().ChangeL(entry);
  	iSmsMtm->SaveMessageL();
}

the following are the header files required

#include <msvapi.h>
#include <mtclreg.h>
#include <SMSCLNT.h>
#include <msvstd.h>
#include <smut.h>
#include <txtrich.h>
#include <SMUTHDR.h>
 
LIBRARY msgs.lib smcm.lib gsmu.lib

Related Links:

• Sending SMS with RSendAs
• SMS Utilities API
• SMS Receiver
• Reading SMS from Inbox
• Sending SMS in S60 3rd Edition - MTM
• SMS Operations
• How to send an SMS using sockets
• Sending-Receiving SMS through an Exe (Server)
• How to Open SMS or MMS Editor