Some background, for reference, to show that Apple has been paying attention to iPhone antennas for ages. Steve Jobs was embarrassed by the iPhone 4 antenna disaster (which primarily affected those holding the phone in their left hand, similar to the poor reception for left-handers in the Nordic Study cited above).
My point in all this: Apple doesn't rearrange the antenna bands for cosmetic or esthetic reasons.
here's an article about Apple's black lab's antenna testing from 2010, which Apple undoubtedly only allowed because of the iPhone 4 controversy:
https://www.engadget.com/2010/07/16/inside-apples-black-lab-wireless-testing-facilities/
and here's a re-hash or the ÿou're holding it wrong" controversy from 2010:
4. Antennagate and the Grip of Death
"Don't hold it that way" isn't a very customer-friendly response to complaints that the new iPhone doesn't work properly when held a certain way. But that was exactly
Steve Jobs' message in 2010 when users started complaining of a "death grip" that caused wireless network connections to weaken or die when holding the then-brand-new
iPhone 4 a certain way.
As evidence mounted that covering the phone's antenna with your hand could dampen the signal, Apple was steadfast that was no issue. After much investigation and discussion, Apple ultimately capitulated and agreed that holding the iPhone 4 a certain way was indeed a problem.
The Aftermath
After relenting, Apple provided free cases to iPhone 4 owners; putting a case between the antenna and the hand was enough to solve the problem. Apple pointed out (correctly) that many smartphones had the same problem, but it still changed its antenna design so that the problem was never as serious again.
source:
http://ipod.about.com/od/iPhoneHelp/tp/The-8-Biggest-Controversies-in-iPhone-History.htm
and Consumer Reports confirmed the iPhone 4 antennagate problem, resulting in Apple shamefacedly issuing free bumpers:
http://www.consumerreports.org/cro/...eports-can-t-recommend-the-iphone-4/index.htm