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I'm not an Australian and gonna visit Sydney next week for more than two weeks for my work.
I've searched on the internet and found that the 4G Wi-Fi modem ($ 59 or $99) is fit for my schedule.
(https://www.optus.com.au/shop/mobilebroadband/prepaid?SID=con:omb:subnav:mbb:pre:listing)
Is this 4G Wi-Fi modem available for non-Australian residents?
I'm wondering it is possible to buy it at the Optus of Sydney airport at the moment when I arrived.
There are not so many information on that because recent people prefer to use the prepaied Sim card rather than the modem.
I know Optus has stores in the major airports for arrivals, so you should not have an issue.
The Australian Government has requirements for ID to sign up for a prepaid service
https://www.acma.gov.au/theACMA/id-checks-for-pre-paid-mobiles