Mobilia is a modular smartphone that consists of 7 interchangeable slots containing hardware and software components. The slots contain items like a camera, hard drive, processor, screen, and Bluetooth/WiFi components. The phone has a core network that delivers power and allows data transfer between the modules. Individual modules can be purchased and swapped as needed based on a user's features, reducing e-waste and making repairs easier. Mobilia is designed to be affordable for users aged 14-22, with prices increasing only based on higher-end modules that are added.