Using an existing phone, apps such as Burner, Hushed and Line2 provide an alternate phone number on a subscription basis. Google's VoIP service is another option (see Google Voice). See burner email.

But now that I have a new burner number, things are turning around. No, this second line on my iPhone isn’t for shady dealings. It’s for diverting the junk—and protecting my digital life. More ...

But now that I have a new burner number, things are turning around. No, this second line on my iPhone isn’t for shady dealings. It’s for diverting the junk—and protecting my digital life.