How can I unregister to the GSM Network?

[Dissem Faé]

Does someone know this? I want to unregister from the GSM network, but not enter the flightmode (I still need SIM access, and it should be fast). The following code works fine on a S100 (WM2003), but the 9100 (WM5) refuses to unregister. Registering works fine on both devices.
GsmControl::GsmControl()
{
errorMsg = TEXT("No ERROR/SUCCESS message to display.");
hLineApp = NULL;
hLine = NULL;
LineInitializeExParams.dwTotalSize = sizeof(LineInitializeExParams);
LineInitializeExParams.dwNeededSize = 0;
LineInitializeExParams.dwUsedSize = 0;
LineInitializeExParams.dwOptions = LINEINITIALIZEEXOPTION_USEEVENT;
LineInitializeExParams.Handles.hEvent = NULL;
LineInitializeExParams.dwCompletionKey = 0;
dwLineAPIVersion = TAPI_CURRENT_VERSION;
GsmInitialize();
}

HRESULT GsmControl::GsmInitialize()
// Initializes TAPI interface
{
res = lineInitializeEx(&hLineApp, NULL, NULL, NULL, &dwNumDevs, &dwLineAPIVersion, &LineInitializeExParams);


res = lineOpen(hLineApp, 0, &hLine, dwLineAPIVersion, 0, 0, LINECALLPRIVILEGE_MONITOR, 0, NULL);
return res;
}

HRESULT GsmControl::GsmLineUnregister()
{
res = lineUnregister(hLine);
// res = lineSetEquipmentState(hLine, LINEEQUIPSTATE_NOTXRX); /* Edit: This is commented out, as I don't want any kind of flightmode behaviour */
return res;
}

HRESULT GsmControl::GsmLineRegister()
{
// lineSetEquipmentState(hLine, LINEEQUIPSTATE_FULL); /* Edit: This is commented out, as I don't want any kind of flightmode behaviour */
res = lineRegister(hLine, LINEREGMODE_AUTOMATIC, NULL, 0);
if ( res != 0 ) //FAILED(res) )
{
errorMsg = TEXT("ERROR GsmLineRegister - lineRegister\n");
} else {
errorMsg = TEXT("SUCCESS GsmLineRegister - lineRegister");
}
return res;
}

[GIR]

Whats the return value of the lineUnregister() call?

[Dissem Faé]

Sorry, I have a problem getting the value. It's larger than zero.
Shouldn't the following code open a message window that says "GsmLineUnregister returned X"?
LPTSTR lpText = new WCHAR[1024];
swprintf(lpText, TEXT("GsmLineUnregister returned $d"), gsmCtrl->GsmLineUnregister());
MessageBox(NULL, lpText, TEXT("Deva Daemon"), MB_ICONINFORMATION);

Edit: I'm making too many mistakes lately. I also commented out lineSetEquipmentState, as that's how I want it to work but it doesn't (on a 9100)

[Dissem Faé]

OK, I've got it now. lineUnregister returns '11'.

Edit: It's not stable, it seems to return quite all kinds of values larger than ten. Each value is larger than its predecessor. After a reboot, I got a 12, and then again increasing numbers (19, 25, 29, 31). It doesn't seem to make any sense.

(Will I ever manage to write a post with no edits this week?)