You don't have a headphone socket anyway
Why not remove all sound features from it. Sound is just so sold fashioned. And while you are at it, remove the display, those only crack and limit your runtime anyway. After a couple of itterations you could have the ideal smartphone, an extremely stylish piece made completely from something as bendy as rubber, but as smooth as acryl or glass, but with no electronics inside... well perhaps you could have some on chip oscillators so you can claim that it's an octacore running at x GHz.