Don't hold iPhone 4 that way, Apple says
'Avoid gripping it in the lower left corner in a way that covers both sides of the black strip in the metal band,' Apple says. Users have found that cradling the iPhone in their hand can cause loss of signalA day after users discovered that cradling Apple Inc.'s new iPhone in your hand may interfere with its antenna and cause it to lose its signal, the company has suggested a solution:
Don't hold it that way.
Apple said that some loss of signal from gripping a handset is "a fact of life for every wireless phone," and that if it happens on the new iPhone, users should "avoid gripping it in the lower left corner in a way that covers both sides of the black strip in the metal band."