Apple iPhone 4: The ultimate price guide - Telegraph

The Apple iPhone 4 goes on sale next Thursday. It is, as the name suggests, the fourth-generation iPhone, and gadget fans will have noticed something of a pattern emerging in terms of the release cycle of Apple's flagship smartphone.

Apple traditionally uses its annual summer developer event, WWDC, to show off its newest iPhone. In 2007, Steve Jobs showed off the original iPhone; in 2008, Apple took the wraps off the iPhone 3G; last year, we saw the introduction of the iPhone 3GS; and just over a week ago, Steve Jobs proudly unveiled the iPhone 4.

Apple iPhone 4: The ultimate price guide - Telegraph