Boost prepaid runs on the Telstra Mobile Network, which is the single most valuable fact about the plan in regional Australia. The wording in the Critical Information Summary is precise and has one important exclusion attached.
The published network clause
The summary states 4G and 5G on the Telstra Mobile Network, excluding 5G standalone mobile sites. So the service reaches Telstra sites, and the 5G available is non-standalone 5G, which uses the existing 4G core alongside a 5G radio layer.
What 5G standalone is and why it matters
A standalone 5G network is a different thing from non-standalone. The summary is explicit that 5G standalone is available in limited areas but access to it is not currently available on a Boost Mobile Plan. Non-standalone 5G improves capacity and throughput on the existing network; it does not give you the low latency or the isolated capacity of a standalone build. Anyone marketing 5G speed to you on this plan is selling you non-standalone 5G.
Where non-standalone 5G is available
The plan page states that Telstra Pre-Paid Mobile Network 5G access is available with a compatible device in most metro and many regional areas, and that you should check the coverage map for where it is predicted. Two qualifiers: a compatible device, and predicted rather than guaranteed.
The published prediction is 5G non-standalone coverage is available in most metro and many regional areas. That is a good default expectation for an Australian city and a weak one for a remote property, which is exactly the case where you need the coverage map rather than a headline.
Coverage. No provider promises coverage street by street, and neither do we. Check the provider coverage map for the addresses you actually care about before you commit to a plan.