The Optus outage in November, which left more than 10 million customers without phone and internet access for up to 14 hours, was behind an influx of complaints.
A March 2021 RBA report found from March 2020 to February 2021, the value of banknotes in circulation rose 17.1% to $97.3 billion because people were holding onto money at home.
Small businesses rattled by Wednesday's massive Optus network outage should hold on to their receipts, Communications Minister Michelle Rowland says, as mobile and internet services gradually return.
