Paywalls for SMS Messages and Calls

Paywall your existing Android phone number for free using the built-in "Do Not Disturb" with the "Priority Only" setting --- no screening app with Google trackers required.

This is one of the first things I do with a new phone. People not on my contacts list can't make my phone ring for any price. You can include SMS in this too if you want.

Amazing how many people don't know this.