It's a good idea.. but it shouldn't look like a nano. Also, those buttons would be really hard to use, and the way you used inner shadowing makes it look like the box is kinda inside the phone
The buttons is there so it looks like a phone, i did not spen so much time on it..
About the shadow, the screen is something like the samsung d500. but here you just slide the screen over the buttons.
I'm sorry if I offended you, but that's just how I see it. It doesn't have the same flow and creativity that Apple's products do. Your buttons were just oval-like shapes. No numbers, no actual keypad... it just doesn't work.