SMSCon can do this. But this runs as a daemon on N900 and so we can stop this? So say if I remove SMSCon I won't be able to use the benefits of this application. Any one can unistall from N900 and change the SIM and do whatever with no SMSCon to track this. So the request here is to include some functionality at the core of the device.( I mean the firmware / OS ).
sudo gainroot