eSIM for Australia including Tasmania

I can't comment on esim deals or pricing, but if you're going to be outside major urban areas, you want something using the Telstra network, as the coverage is notably better. There are a few different options - my friends and I are splilt fairly evenly between Telstra, Boost, Aldi and Woolworths. (Only the first two have full Telstra coverage, as I think the latter use Telstra's wholesale network, but for the Blue Mountains at least, I can confirm there's no noticeable diffference. If you're doing very serious hiking you'll need an alternative solution regardless.)

The SIMs snoozy has mentioned are all on the Telstra network, so all have the same coverage. And yes, if you're outside the major metro areas then Telstra has the best coverage. Personally I am on the Optus network and find it fine for most places I normally go in Australia, including regional areas (somewhere like the Blue Mountains for example, which is close enough to Sydney), but if you are heading to more rural or remote areas, then as Snoozy days, stick with Telstra as the other networks don't have the same reach.

Well, parts of the Blue Mountains don't have great coverage on any network, but that's more geography than anything else (e.g. Megalong Valley, though it's better than it was).

@Simon, apparently there is a minor difference in network access between Boost/Telstra and Aldi/Woolworths, but I've never been remote enough to really notice the edge cases (or else I was so remote there was no coverage at all, at least a few years ago).

I used my Airalo eSIM for data with no problems in Melbourne and Hobart (and down the GOR). I didn’t go to Sydney or Lauceston.

Thanks all. I'll download maps like I typically do as back up if we lose service somewhere. I used Airalo in England and it worked well and would feel familiar.

More as a general PSA than advice for the experienced traveller or a comment against Airalo: depending on where you end up and what you're doing, esp. in places like Tassie, Blue Mountains and isolated rural roads more generally, I'd recommend both offline maps and regular hiking precautions (notifying someone of your plans, enough water, clothes etc), as there are a few more dead phone reception spots than one might think.

Obviously much less of an issue in cities and where most tourists are likely to end up - just wanted to make sure I'd said it. (My volunteer rescue friends would never forgive me otherwise!)