I did a reverse lookup for a phone number that was harassing me with text messages. It returned with an 87 year old woman living in Florida.
Im 99.99% sure its not her texting me little messages. They also trick you into buying additional features without you realizing it. Customer support said they can not do anything to help. Its basically the same thing if you search the phone number on an internet browser, except it wont cost you anything to search on the internet!
Dont use Intelius. In my opinion, its a scam, it seduces you into thinking they have information, but it just searches the web, which you can do for free!