Is it worth using a reverse cell phone service on a strange phone 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 phone 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 that someone is going to take action then you need to get in touch with the company that provides them their service. The police may not have the power to do anything, but their service provider will take the matter seriously and it could lead to the person making the calls being disconnected.
The problem is you can’t phone their service provider without using a reverse phone number 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 find out 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 combo gives you the best chance of getting the person into trouble (just make sure it wasn’t a wrong number first!). 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 you are no longer being a faceless victim and most people are cowards and will just stop straight away.