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How to go about using an iPhone internet signal with a desktop?

I am thinking of getting an iPhone or Smartphone. It seems that they have an all-you-can-use internet plan on them. What is the possibility of somehow using that signal on a regular computer; I mean the signal is wireless, right? It would be nice to only pay for one internet plan. How to go about using an iPhone internet signal with a desktop? I would really appreciate your useful assistance regarding this. Thanks.