Orange customers can only get the iPhone 4 for free if they take out a two-year £75 per month contract.

According to the mobile network's iPhone tariff details, which were released yesterday, the package for the 16GB version of the handset in either black or white, comes with unlimited calls and unlimited texts.

Orange is also offering an 'unlimited' data allowance across all of its iPhone 4 tariffs. However, a fair usage policy means the allowance is capped at 750MB. The Wi-Fi allowance is also capped at 750MB.

The cheapest two-year iPhone contract is £30 a month, with a £169 charge for the phone, while for those that want an 18-month contract, prices start from £35. However, they will have to pay £229 towards the handset.

The 32GB capacity iPhone 4 is also available on the same tariffs, however a handset charge is applicable on all packages.

Alternatively, the handset is also available on a pay-as-you-go basis. Its costs £480 for the 16GB version, and £570 for the 32GB capacity handset. This is less than the sim-free prices Apple released earlier this week.

Packages for business users start from £30 per month, with a £101 handset charge.

However, the handset still isn't available to pre-order from the mobile network yet.

Orange is the first mobile network to confirm it's pricing for Apple's new smartphone. O2 has unveiled details on the tariffs the handset is available on, but not any charges customers will have to pay towards the handset.

Meanwhile, Vodafone's pricing was leaked on the web this week. However, the network refused to confirm the charges.

T-Mobile, 3 and Tesco Mobile, which announced yesterday it will be stocking the handset, have yet to release pricing details.

Apple's latest smartphone was unveiled by Steve Jobs last week at the company's Worldwide Developers Conference (WWDC).

The new handset, which features an all-new design, has "well over 100 new features" including an HD screen, video calling, a gyroscope, a new iMovie app and countless other upgrades.

See also: O2 unveils iPhone 4 early upgrade offer

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