Optus provide month-to-month contract mobile broadband. Keep in mind it is still a contract. We understand being locked into lengthy contracts are so annoying, so you can visit optus mobile broadband page here and decide a plan for yourself. You also have the option of SIM ONLY which seems like a smart move which lots of users are leaning towards lately. Optus also provide prepaid mobile broadband services, so you don't have to do those scary veda credit rating checks.