On the iPhone, turn on 'Silence Unknown Callers'. in your Settings -> Phone. Silences unknown numbers, but does let your contacts and recent calls and Siri suggestions get through.
Even then, I just don't answer my phone haha. I just Tyler Durden that #### and call someone back if it's important. You're not legally obligated to answer your phone anyways, so I don't. It's been amazing.
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