IPhone internet tethering Optus?

On your iPhone you are able to share your data with your laptop or other devices (tethering). Basically you can use your iPhone as a 3G modem.
I'm on a prepaid Optus plan that includes 5GB of data BUT Optus decides that they think we should pay $15/month to use this iPhone feature with separate data.

Is there a way I can do this for free without Jailbreaking my iPhone?

No, the phone company decides that they want you to be able to do that or not.

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