phonenumberus is made for the people who has got a lot of spam call to their phone. They can easily search the unwanted or spam call from this site and can easily knows that the caller is spammer or not. They can also identify the fake number from hour site.
There are million spammers who call to a number and ask them unwanted or personal question for tricking them. This many be called one kinds of harassment. So phonenumberus is in the only one site which gives the user about the spamming call or unwanted calls whether those calls are spam call or not.