How do I manually block phone numbers on iPhone
I am continually receiving robo calls from a telephone prefix spoofing my own phone numeber's area code and prefix. I want to block the entire range of numbers. Example 212-123-xxxx - I want to block 10000 numbers (0000-9999) - How do I manually add the numbers, yes I realize it would be painful, but I want to know how.
iPhone 6, iOS 10.3.1