iPhone Duo review: outer screen is the worst iPhone, inner is a splendid tablet

John Gruber of Daring Fireball called the iPhone Duo's outer screen the worst iPhone Apple has ever made, while praising the inner display as a splendid tablet with a UI that bests the iPad's.

• Outer screen called the worst iPhone Apple has ever made
• Inner display praised as a splendid tablet
• Inner UI said to best the iPad's
• Reviewer questions the device's thickness and pocketability