Apple found out the hard way with the iPhone 4. Their secrecy didn't help. People doing real world testing had a case that made it look like an iPhone 3s and that also happened to mitigate the death grip problem. We know this because one was stolen and given to gizmodo.
And that was even only antenna design, they still used a standard RF stack then.
alt Hacker News
Yeah but also RF in the real world is hard.
Apple found out the hard way with the iPhone 4. Their secrecy didn't help. People doing real world testing had a case that made it look like an iPhone 3s and that also happened to mitigate the death grip problem. We know this because one was stolen and given to gizmodo.
And that was even only antenna design, they still used a standard RF stack then.