Correlation is not causation.

There is no clear link to the iPhone causing lower teller employment.

This article does have a glaring omission: The 2008 financial crisis effects on the banking industry in general. When there are fewer local banks there are naturally fewer tellers employed. Bank failures peaked in 2010 in the aftershocks of the crises, which lines up nicely with the articles timeline.

yeah weird. Same goes for the "ATMs increased demand for tellers" strange idea suggested earlier in the article, which was automatically disproven right there by actually attributing the growth in tellers to deregulation. Which one is it?