Credit to https://www.ozbargain.com.au/node/151329
Reminder for those who don't have unlimited international calls to USA& Canada (with boost for eg), they can still do it using Google hangouts.
Free calls to the USA and Canada via your browser or even iOS app sounds like a deal to me!
EDIT: Since some people seem to not know the difference between hangouts vs ZOOM/Whats app/messenger calls etc etc:
Hangouts can DIAL A MOBILE NUMBER with the other end not needing to have the app etc