Engadget has an interesting article, including example videos, about the new iPhone 4 hardware dropping calls in a left hand. It seems that touching both casing antennas with enough of the hand lets them interfere with each other.
The cure? any kind of insulating wrapper, like a rubber case.
Link: http://www.engadget.com/2010/06/24/some-iphone-4-models-see-signals-drop-to-0-when-held-left-handed/

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