Add burner numbers to your existing phone with an app that protects your privacy when buying and selling from strangers or dating on-line.

You don't need to buy a throw-away "Burner" phone to be untraceable.  Add an app to your phone to rent additional blind numbers that will be routed through the the Burner site to your own phone.  The oldest supplier is called, unsurprisingly, Burner.  This has got to be especially helpful for dealing with strangers on dating sites and for buying and selling with strangers, and to consolidate other phone numbers to ring your phone.

You can pick a number at their web site for your area code with a 7 day free trial.  Go for a prepaid number of calls and texts in $5 increments, or rent the numbers monthly (About $5/line) or annually (About $50 per line).

Other suppliers are Hushed, Sideline and Flyp, written up at popsci.com here with links and reviews.