with verizon you can log into your account online and enter the number and it will be blocked....if its another carrier check online or just call customer service and they should be able to do it...just tell them its harrasing calls
Just another reason to hack your cell with a custom ROM. Most all the carrier's want to charge you a monthly fee for the block service. It's part of the ROM I'm running on my droid under phone settings; "Black Listed"
if its a verizon phone you log on the site and go into safeguards and you can block up to 5 numbers. unfortunately verizon is still in the dark ages on blocking private calls and thees no way to do that.