[KirinDave]

I've had and heavily used the phone since launch. I frequently hold it with my left hand both for calls and for things like Foursquare checkins. I do not use a case or tape.

I've yet to have the issue come up in a real world scenario. It's certainly not a problem for calling unless you hold your phone like a coconut shell to your head. It's more of a threat when you're using your thumb on the phone while holding it in your left hand. Perhaps my wife, friends, and family all have curiously shaped hands that find the required grip renders actual use of the uncomfortable.

Of course, in every other way the iPhone 4 seems to be an incredible smartphone; I suppose even if there is a problem requiring conscious thought for some people, it's on balance with the kinds of problems other handsets have. I mean, the battery life alone is something to drive upgrades: http://bit.ly/aeKf0n And the iPhone's past reception issues has been dramatically improved. I'm one of those unfortunates who has a home "sort of" covered by AT&T, and the difference between the iPhone 4's dropped/missed calls and the 3GS's dropped/missed calls is very noticeable.