Passcode Burner promotion shows how much phone numbers reveal

The Burner Challenge from app maker Ad Hoc Labs lets anyone see how much data can be gleaned from their digits. It's a lot. 

Melanie Stetson Freeman/The Christian Science Monitor

It can be unsettling to watch a computer spit out your personal information before it even knows your name. Especially when the information appears in a terminal font, superimposed over a map of your area.