From Forum Nokia Wiki

CImeiReader example illustrates how to read IMEI (which is an identification number that is unique for each mobile phone) in 3rd Edition Symbian devices. Note that this code will most likely not work in the emulator. Thus, you should only use it in real devices.

IMEI_Getter.cpp

#include <COEMAIN.H>
#include <BAUTILS.H>
#include <apmrec.h> 
#include <apgcli.h>
#include <smut.h> 
 
CImeiReader* CImeiReader::NewL(MImeiObserver* aObserver)
    {
    CImeiReader* self = NewLC(aObserver);
    CleanupStack::Pop(self);
    return self;
    }
    
CImeiReader* CImeiReader::NewLC(MImeiObserver* aObserver)
    {
    CImeiReader* self = new (ELeave) CImeiReader(aObserver);
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
    }
    
  
CImeiReader::CImeiReader(MImeiObserver* aObserver)
:CActive(0),iObserver(aObserver),iIdV1Pkg(iIdV1)
{
}
 
CImeiReader::~CImeiReader()
{
	Cancel();
	delete iTelephony;	
}
 
 
void CImeiReader::ConstructL(void)
{	
	CActiveScheduler::Add(this);
	
	iTelephony = CTelephony::NewL();
	iTelephony->GetPhoneId(iStatus,iIdV1Pkg);
	SetActive();	
}
 
void CImeiReader::DoCancel()
{
	iTelephony->CancelAsync(CTelephony::EGetPhoneIdCancel);
}
 
void CImeiReader::RunL()
{
	iObserver->GotIMEIL(iIdV1.iSerialNumber,iStatus.Int());
}

IMEI_Getter.h

#include <e32base.h>
#include <F32FILE.H>
#include <d32dbms.h>
#include <BADESCA.H>
#include <Etel3rdParty.h>
#include <MTCLREG.H>
 
 
	class MImeiObserver
	{
	public:	//	New methods
		virtual void	GotIMEIL(const TDesC& aIMEI,TInt aError) = 0;
	};
 
	class CImeiReader : public CActive
	    {
	    
	public:
		static CImeiReader* NewL(MImeiObserver* aObserver);
		static CImeiReader* NewLC(MImeiObserver* aObserver);
		~CImeiReader();
	protected:	
		void DoCancel();
		void RunL();
	private:
		CImeiReader(MImeiObserver* aObserver);
	    void ConstructL(void);
	private:
		MImeiObserver* 				iObserver;
		CTelephony* 				iTelephony;
    	CTelephony::TPhoneIdV1 		iIdV1;    
    	CTelephony::TPhoneIdV1Pckg 	iIdV1Pkg;
	    };

See Also

• Reading IMEI in 3rd edition -Synchronously
• IMEI on Wikipedia
• Online tool to analyze IMEI
• DevInfo - Get the IMEI, IMSI, CellId etc., synchronously on 3.x devices.