From Forum Nokia Wiki

ID	TSS001440	Creation date	June 23, 2009
Platform	S60 3rd Edition, FP1 S60 3rd Edition, FP2	Devices	Tested on Nokia N96
Category	Symbian C++	Subcategory

Keywords (APIs, classes, methods, functions): CTelephony

Description

The phone network registration status can be monitored with the CTelephony::NotifyChange() function, with ENetworkRegistrationStatusChange as the second parameter.

Solution

The following sample code explains how to monitor changes in the network registration status when the phone is registering to a network.

NetworkRegister.h

#include <e32base.h> 
  #include <etelmm.h>       // link against etel.lib
  #include <Etel3rdParty.h> // link against Etel3rdParty.lib
 
 
 class CNetRegister : public CActive 
   {
 
 public:	
 
   // static constructor + destructor
   static CNetRegister* NewL();
   ~CNetRegister();
 
 public:
 
  void IssueRequest();
 
 protected: // from CActive
   virtual void DoCancel();
   virtual void RunL();
 
 private:    // private constructors
 
   CNetRegister();
   void ConstructL();
 
 private:    // data
   RTelServer                             iTelServer;
   RMobilePhone                           iPhone;
   TFileName                              iTsyName;
   CTelephony* iTelephony;
   CTelephony::TNetworkRegistrationV1     iNetworkRegistrationV1;
   CTelephony::TNetworkRegistrationV1Pckg iNetworkRegistrationV1Pckg;	
   RMobilePhone::TMobilePhoneNetworkMode  iRegStatus;
   };

NetworkRegister.cpp

#include "NetworkRegister.h"
 
 
  CNetRegister* CNetRegister::NewL() 
    {	
    CNetRegister* self = new (ELeave) CNetRegister;
    CleanupStack::PushL(self);
    self->ConstructL();
    CleanupStack::Pop(); // self
    return self;
    }
 
 
  CNetRegister::CNetRegister()
  : CActive(EPriorityHigh),
    iNetworkRegistrationV1Pckg(iNetworkRegistrationV1)
    {
    }
 
 
  void CNetRegister::ConstructL() 
    {
    iTelephony = CTelephony::NewL();
    User::LeaveIfError(iTelServer.Connect());
 
    // Load the appropriate TSY
    iTelServer.RTelServer::GetTsyName(0, iTsyName);
    User::LeaveIfError(iTelServer.LoadPhoneModule(iTsyName));
 
    // Open the first available phone
    RTelServer::TPhoneInfo phoneInfo;
    User::LeaveIfError(iTelServer.GetPhoneInfo(0, phoneInfo));
    User::LeaveIfError(iPhone.Open(iTelServer, phoneInfo.iName));
    CActiveScheduler::Add(this);
    IssueRequest();
    }
 
 
  CNetRegister::~CNetRegister() 
    {	
    Cancel();
    delete iTelephony;
    iTelServer.Close();
    }
 
 
  void CNetRegister::RunL() 
    {
    if( iStatus == KErrNone )
      {
      CTelephony::TRegistrationStatus regStatus = iNetworkRegistrationV1.iRegStatus;
      // regStatus now contains the current network registration status
      }
    else
      {
      // Handle errors
      }
 
    IssueRequest();
    }
 
 
  void CNetRegister::DoCancel()
    {
    iTelephony->CancelAsync(CTelephony::ENetworkRegistrationStatusChangeCancel);
    }
 
 
  void CNetRegister::IssueRequest()
    {
    iTelephony->NotifyChange( iStatus,
                              CTelephony::ENetworkRegistrationStatusChange,
                              iNetworkRegistrationV1Pckg);
    SetActive();
    }

Possible values for network registration state are listed below:

ERegistrationUnknown              Registration status is unknown.
 
  ENotRegisteredNoService           Not registered. The ME can not detect any
                                    other networks and is not currently searching
                                    for a new operator to register to.
 
  ENotRegisteredEmergencyOnly       Not registered. The ME can detect other
                                    networks in which it is possible to make 
                                    emergency calls only.
 
  ENotRegisteredSearching           Not registered, but the ME is currently
                                    searching for a new operator to register to.
 
  ERegisteredBusy                   Registered, network busy.
 
  ERegisteredOnHomeNetwork          Registered on home network.
 
  ERegistrationDenied               Registration denied.
 
  ERegisteredRoaming                Registered, roaming.

Required capabilities: ReadDeviceData.