In 2015 nearly 80% of Australians had access to a smartphone(1). You can vote over a long period of time and will likely want to vote on things that interest you or you have experience in, which may only be a few times a year. On those occasions, you can access the internet in community centres, libraries, get help from family, friends or carers who have a smartphone.
1. Mobile Consumer Survey 2015 - Deloitte Australia