NAB's implementation makes a lot of sense to me: biometric verification embedded in phones (I assume the bank is referring to *mobile* and not just ‘phone' banking, but either way biometric-authenticated mobile or landline phone access a solid idea.)

Of course, biometric authentication has been talked about as the next big thing since before I was a young man, and every now and again someone naively talks about it as though some relatively ordinary set of new events will cause breakthrough levels of adoption. Yet imagine if end users could designate that no "high-risk activities" (transfers, large withdrawals, etc) could occur through any remote channel unless bio auth were used thru a mobile device. N=1, I know how this would affect me: more of my deposits and transactions would be at the bank that offered this control feature. Phone banking (mobile or landline) could be the alarm that finally wakes the sleeping giant of biometric security.