Apple later commented that an iPhone 6 Plus bending under normal use is "
extremely rare," adding that it had received only nine complaints from customers about the issue at the time.
To be specific, Apple said that only nine people had "contacted Apple" about bent iPhone 6 Pluses at the moment of their acknowledgement of the problem, six days after launch.
At the time, most people had gotten their phone from a carrier, which is who they would've contacted, not Apple. Plus forums were full of people urging everyone to wait for Apple to say something before complaining to Apple, the return period was only halfway up, and people tend to not report problems quickly, especially if they think they caused it.
Apple smartly rushed to publicize this cherry-picked number while it was still low enough to be influential on opinions (and while carefully ignoring any other complaint venues).
They never publicly updated the value, though. If it was nine in a few days just to them, then how many over a year via all complaint / return venues? Hundreds? Thousands? Still a small percentage, but they were happy to leave "only nine" stuck in the public consciousness. And it worked; just look at how many people blindly repeat it.
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As to whether it was a design flaw, an
engineering analysis noted that the brace for the volume switch, instead mistakenly acted as a fulcrum to make it easier to bend at that particular location.
This is the difference between the bending tests that sites rushed to perform, and the actual problem at hand. It was not about pressure in the middle or a three point test, it was about the bending moment at that critical location.
It's like the difference between death-gripping phones to make the signal go down, and touching a single spot on the iPhone. One is expected, the other is a design flaw.
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Such flaws tend to get past testing, when secrecy is more important than sharing experiences using a non-cased, normally used device. As long as Apple values secrecy more, these preventable errors will continue to get through.