Blocking Someone On An Iphone?

Ridiculous question, maybe, but I cant figure out how to do it.

I've had disposable Android phones, and another phone briefly that I had to change in.

A few weeks ago, someone called me, and I ran for the phone and did not look at the number.

Now this person is periodically calling me, and I do not want to talk to them.

Yet, it seems much more difficult to block people on this IPhone SE than it was on the old disposable Android phones, or even on the other type of phone I had for a short time.

If any technical people on the forum would have advice of how to do so, I would greatly appreciate it, as I really want to put this person on ignore for good

Thanks

Someone I know helped me and told me what to do.

Glad this person is on block.