Cupertino, Calif.-based Apple has finally extended its iWork productivity apps for iPhone and iPod Touch.

Three iWork productivity apps, viz. Pages, Numbers and Keynote, are now available for the iPhone 4, iPhone 3GS, third and fourth-generation iPod Touch and the iPad, each at a cost of 5.99 pounds. Users of the iPad have been enjoying the three iWork productivity apps since the launch of the tablet since 2010.

While, the Pages and Numbers apps are Apple’s word processor and iWord spreadsheet, Keynote is presentation maker.

The productivity apps can import and export documents from iWork for Mac and from Microsoft Office. These apps can print wirelessly using Apple’s AirPrint technology, which made debut with iOS 4.2 in November last year.

Apple also confirmed that it would launch its iOS 5, Mac OS X as well as much-rumored music streaming service iCloud at this year’s Worldwide Developers Conference (WWDC).

Apple’s Chief Executive Steve Jobs, who has been on medical leave since January, would also make an appearance at the company’s upcoming WWDC