You can buy a modem from Infinity. There are two options. The first is TP-Link TL-WR841N Router at $40. The second option is Netcomm Wireless N300 at $99.
There are two voice options if you want to bundle a phone plan. One is UNI-V and the other is VoIP.
Under UNI-V, monthly charge is $9.95. Calls to local land lines cost $0.03 per minute, national calls are $0.04 per minute and calls to Australian mobiles are $0.09 per minute.
Under VoIP, a Starter Voice Plan of $9.95 per month comes with local and national calls at $0.10 and mobile calls at $0.27 per minute. Uncapped National Plan of $14.95 per month comes with unlimited local and national calls, and mobile calls at $0.22 per minute. Uncapped All Plan of $35 per month makes all calls including mobiles unlimited.