Funny, I just tried both, earlier!
iPhone upside down would work while wearing jeans, where it can't wriggle itself to go "sideways". However, I notice that the wire eventually slides from the side of the iPhone to the middle of the back/front, which eventually results in still stressing the wire -- just this time it's the other way.
iPhone sideways worked with loose gym shorts, though it kinda felt weird at first. I can't have the iPhone sideways while wearing jeans, as I have fat quads, and don't wear jeans bigger than "Loose Fit". I may try iPhone sideways when wearing dress pants.
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Simple solution to simple problem: put your iPhone upside down or lying on the side. However the jack looks pretty sturdy and should withstand this for a long time.
After 3 more hours, I still find the highs to be quite strong, while the bass seemed to have picked up a little more volume. Again, it could be just be me / my ears adjusting to it.
I don't remember if there were impressions on this thread regarding piano's and the GR07, but I didn't enjoy the song Kiss The Rain by Yiruma with the GR07. I'll listen to the song again after a few days of burn-in, but for now, something seemed off.
EDIT. Noticed the same thing on the piano portion of the The Scientist by Coldplay. The ssss and sssh's parts of the vocal also gets fatiguing right now. Yep, I'll definitely let the GR07 burn in for a couple days straight....