O2 has just released its new price plans for smartphones, including the forthcoming iPhone 4. And, as we predicted, it has opted for a multi-tiered data system.

Revealed on its iPhone 4 hub, the provider has listed numerous Pay Monthly tariffs, starting at £15 on its 12 month simplicity scheme, up to £65 per month for unlimited minutes and texts, and 1GB of data.

o2 iphone 4 price plans emerge image 2

More interesting though, is the structure for its tiered data plans, where it offers either 500MB, 750MB and 1GB on all of its, increasingly pricier, tariffs.

The operator also provides additional data bolt-on packages at £5 extra per month for 500GB or £10 extra per month for 1GB.

However, none of these come into effect until October 1, as O2 is running it unlimited data promotion until then - presumably because customers would rapidly exceed any limits by watching World Cup games streamed over 3G, for example.

There's still no word on the price of Apple's handset (launched on June 24 2010), which Pay & Go customers can pay outright, although we already know that a limited time offer allows existing O2 customers to buy out their current contracts for £20 per month remaining.

Don't forget to check out the rest of Pocket-lint's extensive coverage on the iPhone 4.