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There are only three operators in Australia that actually own and operate their own networks, and they are:
All three have booths just outside Customs at both Sydney and Melbourne (and probably other major airports too). I'm not going to go into plan details, since these change at the drop of a hat, but at time of writing (Dec 2014) Optus's $2/day with 500MB/day plan is about as good as it gets.
It's probably worth mentioning that comparing plans in Australia is (intentionally) really difficult, since all operators work on a basis of giving you funny money and pricing everything in funny money. For example, paying $20 might get you $200 of "credit", but phone calls then cost you $7/min (actually $0.70/min), and of course the ratio of real money to credit varies based on the operator and plan you pick.
There are also "virtual operators" (MVNO) like Amaysim and Lebara that license the big boys' networks. They claim to be cheaper, and occasionally may be, but tend to have really shoddy customer support, puny data speed limits in the small print, etc. The small savings aren't worth the potential for big hassle in my opinion, but YMMV.
Source: Have used SIMs from all three companies, and seen my wife struggle with a MVNO I shall not deign to advertise. Currently on Telstra and happy with it.
Upvote:0
Just to expand on the list, you might also want to check out Yomojo which replaced Yatango Mobile.