Block phone number exchange on iPhone?

Reposting a prior member’s question that was not answered.

Blocking calls from an entire exchange or area code

I know that it is possible to block a specific number on the iPhone, but a lot of telemarketers these days use many different numbers from the same exchange. When I block one number they simply call me from another one using the same exchange with a different last 4 digits. On my Ooma phone service that I use for my land line I can block an unwanted exchange by entering the number on my blocked caller list using the area code, the 3 digit exchange and then ****. Does anyone know if this works on the iPhone?

[Re-Titled by Moderator]