It's official. Consumer Reports' engineers have just completed testing the iPhone 4, and have confirmed that there is a problem with its reception. When your finger or hand touches a spot on the phone's lower left side—an easy thing, especially for lefties—the signal can significantly degrade enough to cause you to lose your connection altogether if you're in an area with a weak signal. Due to this problem, we can't recommend the iPhone 4.
link: Consumer Reports Electronics Blog: Lab tests: Why Consumer Reports can't recommend the iPhone 4
Just for the record: The last time I paid any attention at all to a Consumer Reports review I would up with a 70-something Volvo station wagon - without question and beyond all doubt the worst car I ever owned. I can still, nearly 40 years later, correctly identify the sound of miscellaneous parts falling off a Volvo.
So when Consumer Reports doesn't like something I start to get interested.