Optus has announced comprehensive plans for the upcoming 3G iPhone including an option to buy the handset outright on a pre-paid basis.

On pre-paid, the 8GB and 16GB models will cost $729 and $849, respectively. Optus is offering $30, $40 $50, $70 and $100 cap plans.

The pre-paid handset can be unlocked for use on other mobile networks for an $80 fee.

For post-paid, the cheapest iPhone plan from Optus is $19 a month with $50 worth of calls and texts and 100MB of mobile internet data. On top of this, for the 8GB model, the handset itself costs $51 a month on a one year contract and $21 a month on a two year contract.

For $79 and no upfront cost (for the 8GB model on a two year contract) customers receive $550 worth of calls and texts and 700MB of mobile internet data.

The largest post-paid plan is $179 a month and includes $1500 worth of calls and texts and 1GB of mobile internet data. The handset itself is free if customers choose a 24-month contract or $23 a month for the 8GB version on a 12-month contract.

There are a plethora of different post-paid plan options depending on the model (8GB or 16GB), the length of the contract (one or two years) and whether the customer wants a cap plan or a pay-as-you-go plan.

Full pricing details for post-paid and pre-paid can be found here and here.

Those who connect to a two year plan before the end of August will receive unlimited free web browsing for the first month. Pre-paid customers also receive a "start up bonus" including $400 credit and 1GB of internet browsing.

Optus, Telstra and Vodafone will all start selling the iPhone from next Friday.

Telstra's two-year iPhone plans start at $30 a month with an upfront cost of $279 for the 8GB model and $399 for the 16GB model.

Those who opt for an $80 a month plan will receive an 8GB iPhone at no cost, while those on the $100 a month plan could get either the 16GB or 8GB models at no cost.

Telstra has yet to announce a detailed breakdown of its iPhone plans and refused to say whether it would sell the iPhone on a prepaid basis.

Vodafone has yet to announce its pricing plans.

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