How do I block all in coming calls that do not show on my caller Id. Phone says "no caller id" This particular call is from a place selling septic tank cleaner. They leave an automated voice mail. They are calling me over and over. I am on the national do not call list but that's no help. Because the caller id doesn't show anything I can't even report them.
I remember in the past calling a number and before my call would go thru I would have to enter my phone number so the party I was calling knew who was calling them. That is what I want to do. I want to block all calls from "no caller id" "number unavailable" Just FYI my phone is an IPHONE 5 and I am on Verizon.
Any help would be appreciated.
Thanks