This is incredibly solvable, and it costs me $2 per month. I use a VOIP provider and give out that phone number. I ban all incoming calls from numbers not in my

This is incredibly solvable, and it costs me $2 per month. I use a VOIP provider and give out that phone number. I ban all incoming calls from numbers not in my phonebook. The phone number plays an IVR - and you can leave a voicemail which is e-mailed to me. If you're someone I know (friend, bank) you have my extension - unlisted in the IVR, and you can enter it. I've received zero unwanted calls in the 2 years I've been doing this.