Australia, New Zealand, Tasmania
All over Australia Thuraya or Inmarsat‘s phone will do very well. For offshore islands we recommend no more Thuraya phone. Here is no longer full-time connection provided because the Thuraya satellite commutes around the equator line (6 ° geosynchronous). Therefore there are time constraints. Basically Iridium can be used in Australia and New Zealand too.
In New Zealand and Tasmania you’ll prefer Inmarsat or Iridium satellite network.