I have a landline for business reasons, and that thing gets a dozen robocalls a day. The telco's voicemail apparently has trouble understanding that two seconds of static followed by a hangup is not worth saving.

The cell spam is relentless. I even get three calls a week (always from new, different numbers) to my iPhone that leave messages in Mandarin. I don't speak Mandarin. I've never done business anywhere that would warrant that.

I needed a VM spam filter years ago.