During the iPhone 4 Conference, addressing problems of antenna, Steve Jobs showcased pictures of special rooms in which Apple tests their iPhone, before launching into market. Check out Apple antenna design lab video after the break!

It is being said that, Apple has invested more than $100 million building its advanced antenna design and test labs with 17 anechoic chambers and engineers logs thousands of hours designing and testing iPhone 4 in these state-of-the-art facilities.
Apple Antenna Design and Test Lab Video
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