I work for a huge bank and we tested voice recognition technology: Even under the best circumstances (high quality microphone with no ambient noise in a sound booth), it was far, far too easy to copy someone else’s voice by simply playing back a sliced up recording a la Sneakers (the movie). We ruled it out as an option over a decade ago.

The problem was fundamental and had nothing to do with the quality of the technology. If your bank is using your voice as a unique identifier they had better be using something else in addition to it! Because it’s super insecure.