Using iPad / iPhone as a Modem

With Nokia you can connect your handset using PC Suit and use it as a modem to browse internet in your desktop. Similarly I have an iPad2 3G for dad. There are some applications that can't run on Mac OS.

Since I am using Vodafone 3G plan, so what is the procedure for applying Vodafone thetering and once i've subscribed for Vodafone thetering, how can I use my iPad 2 as a modem?
 
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