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In this video, an iPhone 4 owner demonstrates how the antenna problem also affects transmission in voice calls. Using only one finger, the voice quality degrades, even dropping completely. He explains the process:

Demonstration of the new iPhone 4 showing problems with TRANSMISSION as well as reception. Note the substantial signal degradation (and subsequent audio dropout) at 2:45-2:50 and 2:58-3:01. By simply MOVING MY FINGER along the side of the iPhone, I can get the call to drop signal and audio!!

The effect his finger has when moved across the seam is undeniable. Mike argues that the problem may be related to a design flaw that affects all phone, or to a batch of units.

http://www.mycomputerplayground.com/index.php?option=com_content&view=article&id=526:test-shows-iphone-antenna-issue-impacts-voice-transmission-too&catid=43:netbooks-tablets-and-mobile-devices&Itemid=80