Heading overseas later and tried to see if I could divert my Vodafone mobile to an overseas number (to still receive calls but avoid roaming) but it seems Voda does not allow this. Does anyone know if any carrier allows divert to overseas numbers now? Heard Telstra used to allow but has since disabled it.
google "voip" or "direct inward dial"
worst case you can get a land line number an do: aus mobile -> aus did -> overseas mobile