Designing my own mobile phone

Hey everybody. I would like to design my own mobile phone. I'm engenieering student and I don't know too much about this world, so I'm asking for the place or the material where I should start looking for information. What I want to do is a kind of old mobile phone, I mean, small and thin like an iPhone 4 or 5 but without touchscreen, only the keyboard, a black and white screen, a camera and an microSD. I'm not in a rush so if you can tell me where can I start learning to achieve my objective it would be great. Thanks you so much community!!