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The problem is being so widely reported that Gizmodo has managed to add 16 videos of the phenomenon, along with many, many user reports. The problem is also repeatable, making it look like a lot more than simple coincidence. One possible answer is in the way the new antenna works. Instead of just picking the strongest signal, the iPhone 4 picks the highest quality signal, the frequency with the least amount of interference. In the current iPhone firmware, this is not yet reflected in the signal display, which still indicates actual strength. Apple has said that this is known bug that it plans to fix. If true, then you shouldn’t actually drop a call, even when your apparent signal-bars drop to zero.