I set my voicemail to something along the following lines:
"If I don't recognize your number or was not expecting your call, I am not picking up the phone. If you need to reach me, leave a voicemail now or send me a text. Otherwise, keep calling and I'll catch on eventually."
If I'm expecting a phone call, I tend to be more willing to picking up unrecognized numbers. Otherwise, I don't pick up. If it's actually important, the person can leave me a voicemail.
"If I don't recognize your number or was not expecting your call, I am not picking up the phone. If you need to reach me, leave a voicemail now or send me a text. Otherwise, keep calling and I'll catch on eventually."
If I'm expecting a phone call, I tend to be more willing to picking up unrecognized numbers. Otherwise, I don't pick up. If it's actually important, the person can leave me a voicemail.