Is it possible to block a nuisance incoming caller from being able to harrass you?

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

block or notify authorities if not just nuisance

sorry that you have top pay for what is already in your user manual for free
Of you have a problem understanding the instruction take it and the instructions to a phone shop and ask some one to do it

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.

I think we can be against this kind of harrassment. So I would recommend an app called LEO Privacy. It can help you add the disgusting phone numbers to blacklist to stop spam and harrassing phone calls from bad guys. LEO Privacy Applock Boost Hide Android Apps on Google Play

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

ring your phone company they will tell you how

Not possible.

You can report the number to the authorities, or
Yes, sort of: go to Settings->Security->Enter lock code here if you've created one(otherwise ignore this step)->Limit Use->Restrict Incoming Calls

From this step, you'll have to choose to restrict incoming calls from anyone NOT in your Contacts <Except Contacts>. You'll still get the voicemails and notifications of who called, but unwanted callers will go right to voicemail and you can call them back whenever you are ready.