Is it better to travel to Australia and get a local phone card or rent a roaming treasure?

Making local calling cards, ranging from 10 to tens of Australian dollars, is very cost-effective. What I did recently just happened to catch up with the activity, 5G traffic, 160 minutes of unlimited calls between foreign countries and Australia, as long as 30 Australian dollars. No activity, this is 1. 5G traffic, everything else is the same, just throw it away after swimming.