The common objection to using your phone for purchases is that any sufficiently-motivated criminal could lop off your thumb and go on a spending spree. That's one of the reasons why Japanese carrier NTT DoCoMo and Fujitsu have teamed up to unveil the Arrows NX F-04G. The pair say that it's the world's first smartphone with iris recognition technology that can be used to both unlock a device and certify mobile wallet payments.

http://www.engadget.com/2015/05/13/i...nning-j-phone/