I don't pickup my cell unless it's from someone I know. I get at least a couple a day and my parent's landline gets even more. I use google voice for voicemail

I don't pickup my cell unless it's from someone I know. I get at least a couple a day and my parent's landline gets even more. I use google voice for voicemail and get zero service at work so I get notifications about having a voicemail throughout the day. Most of my voicemailbox is recordings of spammers and robocallers. Google has started identifying spammer numbers by a report service so anyone can flag a number as spam. This helps a bit but most of the calls don't show up as spammers. It's no use to delete the numbers because they will probably never be used again to call me.