Reddit reviews ASICS Men's Aptitude 2 Run Pant, Black, Medium

Sorry in advance for not actually answering your question, but this is something I used to also worry about since I can't run without music. The "solution" I went with was to get a pair of pants with pockets deep enough that my One wasn't sticking out (which wasn't as easy as it sounds actually!)

Also, not just the One, but all these new big phones would be uncomfortable to use with an armband, don't you think?

EDIT: If you're curious, I ended up buying this pair. The pockets aren't exactly massive, but since the pockets are pretty tight, the phone doesn't really bounce around.