How to block a number on iphone?

This number keeps calling me and its nit private how could i block it and i have verizon

You can't actually block the number on your phone unless you have iOS 7 beta on your device, but you can call your carrier and ask them to block that number.

You will very likely need to contact your wireless carrier in order to block the number. It usually costs.

iOS 7 beta presently has the ability to block voice, iMessage, and FaceTime calls. However, it won't be available to the public until later this year… Probably in the fall.

Here is the Verizon knowledge base article about blocking numbers: http://support.verizonwireless.com/clc/devices/knowledge_base.html?id=20989