Should I use a reverse phone lookup website on a prank call I received?
This is a question that only you can answer, but how badly do you need to know who is trying to harass you?
If you have been receiving prank message or calls then you can just report them to your local police station and then it is in their hands. If you trust them to pursue it then that should be the matter finished. If you really want to be certain the appropriate action is taken then you need to get in contact with their service provider. The police may not have the power to do anything, but their service provider will be interested that one of their customers is behaving like that and it could lead to the individual making the calls being disconnected.
If you decide to go down that route and call their phone provider then you need to use a cell phone number lookup website as without them there is no way of knowing who they are with (unless you phone their voicemail and they haven’t changed their message then sometimes you can tell from that). So the best option is really to use one of these sites and dig up the service provider and the name and address of the person.
Then go to the police and report them and give the name and number, then just to make sure go to the phone company too.
That is a double-whammy that ensures the person gets into trouble. Of course they could carry on anyway - but if you know the name of the person you at least have the upperhand and if you confront them with the evidence and let them know you will just keep reporting them then most people will be too cowardly to carry on when you obviously know it is them.