This graphic shows why some people experience the iPhone 4 signal drop problems while others haven't been able to reproduce it. It also explains why Apple's incoming software update—which promises more accurate signal bars—won't fix the antenna problem.
Experiencing this transmission/reception loss, however, depends on the strength of the signal itself:
• If your signal-to-noise ratio is perfect—like when you have a clear line of sight with a cell tower that is not overloaded—a typical 19.8dB attenuation will leave you with a healthy data transmission. In this case, the interference will not cause any problems to your normal usage of the iPhone 4. Your web pages will load normally and your calls will work just fine.
• However, you can experience the transmission and reception problems when you're working with a moderate quality signal. Since no wireless network provides us with optimal transmission absolutely everywhere, every iPhone 4 user is likely to encounter such problems at some point. In these cases, depending on the signal-to-noise ratio level, the attenuation caused by your hand may make your iPhone 4's signal health drop into dangerous areas, causing data loss and voice quality degradation.
Read the full story at Gizmodo.
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