There is a setting on Iphone that allows you to only accept calls from your contacts.....anyone that wants to get in touch that is not in your contacts will leave a message. I haven't had a spam call in months. DD
Why would they do that? Most of the Spam calls that I get that aren't 'IM CALLING ABOUT BUYING YOUR PROPERTY' are political.
Knock on wood, but I rarely get any spam calls, not sure why, I have AT&T as my provider.......I probably just jinxed myself though
Android also does this. We did it for my father in law because we were afraid he would fall for a scam call.