Have a nuisance caller need 2 block them

Android:

• From the call log, you can disable incoming calls from specific numbers.
• Select the number you want to block, then hit More or the 3-dot menu icon in the upper right corner and choose to Add to reject list.
• This will disable incoming calls from specific numbers.

iPhone:

1. To block someone already added to your iPhone's Contacts, go to Settings > Phone > Call Blocking and Identification > Block Contact.
2. To block a number that isn't saved as a contact in your phone, go to the Phone app > Recents.
3. Click the exclamation mark next to the number.
4. Scroll to the bottom and select Block this Caller.

The video for Android:

The video for iPhone (couldn't find a more updated vid):
And, finally, here's the source article for Android: Block Numbers And Texts ' Block Someone On Android

For iOS: https://www.popsugar.com/tech/How-Block-Number-iPhone-31863584

Some phone services offer protection from nuisance calls. Spectrum has in play a system where you just get one ring from such callers and their number does not even appear in calls missed. But you have to activate the service by calling them. You can request the caller put you on a do not call list but that doesn't stop other nuisance callers.

https://www.fcc.gov/consumers/guides/stop-unwanted-calls-and-texts

Amazon com CPR V5000 Call Blocker Block All Robocalls Political Calls Scam...

How to Get Rid of Unwanted Calls on Your Cell Phone

https://lifehacker.com/im-a-telemarketer-heres-how-to-get-rid-of-me-1540911401

block or notify authorities if not just nuisance

That can be difficult, since even if the phone itself or your carrier has call blocking capabilities, most of the nuisance callers have many different numbers that they can use to call from, and will simply change to another one if you block one. The best solution is to have Caller ID, and any call that blocks their number, or any number that you don't recognize or expect a call from, simply don't answer it. That is the most effective way to stop the calls from coming, since they will usually move on if they receive no response.

store that number as favorite list as "do not pick".when the calls comes in again you know you dont pick it.
or you can go here https://www.donotcall.gov/register/reg.aspx

and you can add your number to do no call list.

Only if you have that future, if not call your local provider and ask for call blocking.

In iOS 7, there is an update that allows you to 'Block the Caller' this should block Text Messages and Calls from that number. If that does not work, you can reach out to Law Enforcement about the harassment, or your Cell Phone carrier to block that number all together... Best of luck with that.

Try this go to incoming calls, then menu, then block callers, should come up,write down the number to block, push block callers and enter the #

use YouMail YouMail.com its free and is easy to use.

Yes. You simply ring your service provider and ask them to block, that particular callers number, and you will never be bothered again. You may have to indicate why you wish this done, however unless asked, you don't need to elaborate, unless you want to.