There are a lot of cool things that could be done in the internet. One of these is to tract unpublished phone numbers. Tracking unpublished phone numbers is also one of the hardest things to do in the web. Apart from the fact that it takes a lot of time to do so, tracking of unpublished phone numbers would also put one's security at risk. There are chances that a person might face civil and criminal charges. One of the reasons could be trespassing of one's privacy. If a person searches for this kind of number, the tendency is for him or her to step on to the private lives of some people who do not want to publish their phone numbers in the internet. This act is particularly dangerous because the police force might think that the person who wants to see these numbers is a hacker or aims to hack to other people's lives and properties. What are the reasons why a person wants to know these numbers? One of the reason behind this is that the person wants to use these numbers as advertisement numbers. Nowadays, advertisements, researches and surveys are also done over the phone. Most published phone numbers have already been called by researchers, surveyors, etc. Those phone numbers which have not yet been published could still be sold by the phone number hunters to advertising company. Companies prefer this kind of advertisement because they could get a direct response from the customers or users of the product. In case they call someone who hates their product, at least they would automatically be able to know the reason why. If in case the customer is irate, they could even give the customer some discounts or even free products just so these advertising companies could get the sympathy of these people. There are some instances in which the phone numbers are not working anymore, in this case advertisers have the lower hand. They cannot do anything about it because most of the unpublished phone numbers are not published because of the reason that these numbers do not exist at all. There are those who sell phone numbers because they just want to sell numbers even if they do not exist. It is a must that advertisers make sure that all numbers all working before buying anything. Some phone numbers could also be found in most social profile sites because these sites require their users to include specific information such as email address, phone number, etc.