A lot of people ask how Apple didn't pick this up in field testing.
I think the answer is that they wrapped the iPhone 4 in plastic to camouflage it as an iPhone 3GS (as we know from the Gizmodo phone). Hence all their field testing was effectively done with bumpers on.
Absolutely. This is a human psychology problem, not an engineering problem. They designed the phone knowing that it suffered more attenuation than other phones, but it also dealt with highly-attenuated signals better than previous iPhones. Overall reception is the same or better, all things considered.
What killed them was the way the reception bars dramatically plunged toward zero within seconds of bridging the antennas. If the iPhone 4 had shipped with the bar distribution formula in 4.0.1 and used the same level of hysteresis as other phones, no one would have noticed the drop and everyone would have happily gone on using their iPhone 4's oblivious to the attenuation.
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A lot of people ask how Apple didn't pick this up in field testing.
I think the answer is that they wrapped the iPhone 4 in plastic to camouflage it as an iPhone 3GS (as we know from the Gizmodo phone). Hence all their field testing was effectively done with bumpers on.
They knew... Steve Jobs: "The iPhone 4 went through all of these tests. We KNEW that if you held it in a certain way, the bars would go down."
Absolutely. This is a human psychology problem, not an engineering problem. They designed the phone knowing that it suffered more attenuation than other phones, but it also dealt with highly-attenuated signals better than previous iPhones. Overall reception is the same or better, all things considered.
What killed them was the way the reception bars dramatically plunged toward zero within seconds of bridging the antennas. If the iPhone 4 had shipped with the bar distribution formula in 4.0.1 and used the same level of hysteresis as other phones, no one would have noticed the drop and everyone would have happily gone on using their iPhone 4's oblivious to the attenuation.
That means they knew something, but not necessarily about the "bridging the gap" problem.