ANSWER:

I have to disagree with Lucas Kauffman here and say Yes, it can.

It is entirely possible to track the phone if you have the IMEI and the phone is currently being used with a new SIM. Simply because they are both used to identify with the network.

Now, if your question was ‘Will they’ instead of ‘Can they’ I would have to agree with Lucas 100% — There is no way they would spend the time and money to track a lost cell phone unless it somehow posed a national security threat.

With a price tag of about $250 new, the Lumia 800 being stolen wouldn’t even qualify as grand theft in my home state. It would cost much more to locate the phone than it would to buy a new one.

I don’t really like cell phone insurance, but this is why the policies exist. Sorry for your loss

David Houde from http://security.stackexchange.com/questions/36181