The question is somehow rhetorical, in a country where mobile phone tacking is not legal the best thing to do is to keep off, quit tracking people’s mobile device!
But due to the fact that in some countries, their present law has not really kept up with the latest advanced technology, take for example the police in some counties; they do track, hack and access information from company’s cell phone without a warrant. Though in those countries mobile phone tracking law may be very effective there are some other legitimate avenues to perform such action without bridging the mobile phone tracking ethics.