CommBank has already invested in NFC with its Kaching platform. While the iPhone lacks NFC, CommBank has built a case called iCarte that adds the function to the iPhone 4 and 4S. CommBank also has integrated NFC into Pi, its .

While iCarte doesn't support the iPhone 5, Unsworth wrote on the CommBank blog that the bank's mobile apps team is "already working on a holistic solution for all CommBank Kaching users (both iPhone and Android) who wish to make contactless payments with their smartphone." A CommBank spokeswoman declined to provide a release timeframe.

"Near Field Communication innovation is part of a broader evolution that include contactless payments and chip-enhanced cards," an NAB spokesman said. "NAB's strategy is to partner with global technology leaders to ensure our customers can benefit from world's best practice in payments."