Trust me it could be a serious situation than you have been taking. You never know if someone with bad intentions has been following your every move and keeping an eye on you at all times. They might be waiting for conducive environment to make their fatal moves. So the prime question is how do you protect yourself from a possible attack?

At the first step you should not use a paid cell phone lookup of their number right away. You can go to popular search sites like Google, Yahoo and Amazon etc and key in their number to search if there are any information pieces available. In order to search in an effective manner you can also associate some keywords like prank caller followed by their number. They can guide you to some information. As soon as you get some suspicious information you should share it with your guardian, teachers or police. They will take the necessary actions. At times some free cell phone lookup directories can also provide personal information of the anonymous caller including their name, locality, sex and city details. You should act in a smart manner and must discover the identity of the anonymous caller as soon as possible.