The company said in a statement its figures showed data usage by its customers had risen by 146% during lockdown, based on a comparison of 16-month periods between October 2018 to February 2020 and March 2020 to July 2021.
The usage of calls and SMS also increased during these periods, up 11.55% and 10% respectively.
Data banking means that customers do not lose any unused data from their monthly quotas; it gets added to the next month's quota.
amaysim chief operating officer Isaac Ward said: “We have a simple objective at amaysim and that is to provide great value mobile plans with outstanding customer service.
"Our customers have been asking us for the data banking feature recently, so in true amaysim style, we listened and delivered. We put our customers first in everything we do and have always offered amazing value mobile and data, but now with this exciting new feature our plans are certainly among the best available in market.
"At the heart of our business is the philosophy of 'big love' for our customers which is enabled by our unique amaysim values and our incredible culture. In fact, we believe in our culture so much that it has become our competitive advantage.
"We will continue to provide our customers more exciting new features and the best customer service in market to match."
Optus completed its acquisition of amaysim on 1 February this year at which time the MVNO had 1.2 million customers.