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You have a number of options for purchasing iPhone: The Missing Manual. You can purchase the book directly from oreilly.com in print and electronic formats. The link to the catalog page is http://oreilly.com/catalog/9780596521...
You may want to consider Safari Books Online -- http://safari.oreilly.com/ -- where you can access this book, as well as thousands of others, and access hundreds of hours of training video, for a monthly subscription fee.
You can purchase this book via the iTunes App store. It's currently number three in the book category.
Lastly, you can purchase this book from your local bookshop.
Are you looking for iPhone UK The Missing Manual 2e? That is the version with 8:02, Friday July 11th on the cover. If so it can be found here http://oreilly.com/catalog/9780955750... or on amazon.co.uk or at good bookstores in the UK, for example Waterstones.
I hope that this helps.