I have a Oneplus and it's pretty big. I have a feature request which would take quite a bit of effort to pull off, but I think would be soooo cool to have. Well, I know that more and more phones are built with accelerometers and gyroscopes. I think it would be cool if, to change a track, you could tap twice the top of the phone, and to go backwards just tap twice the bottom of the phone. Other commands could be used based on number of taps and the placement. I have a wire with a track changer on it, but it's not as easy as what I'm describing since it takes a moment to get the controls in your hand from the dangling wire and press the button. Also, I live in Canada and it's extremely cold, I would rather keep my hands tucked away and tap on my pocket then expose my fingers to the cold to change tracks.