Useless for Australia
I got an Australian Circles.Life SIM, but apparently the related app is only available in the AU Appstore. Quite strange, as they're selling in a stall at the airport's Arrivals hall, so mostly to tourists (read: people that are registered in other Appstores). And they also sell long-term contracts requiring the app to manage. This is either very shortsighted or a scam to get tourists to pay for months after they've left the country. I fear the latter....