Disclosed herein are compositions and one-step synthesis of coreshell nanocrystal quantum dots. The process includes, on a semiconductive substrate, thermally oxidizing a first portion of the substrate into an oxide layer, forming Silicon ions within the layer of oxide, and thermally treating the Silicon ions to become the thin layer of Silicon nanocrystals. Accordingly, allocated data usage information associated with the mobile device is retrieved from a subscription profile server. A discount is applied to the customer order in response to a signal that is generated that indicates the accumulated discounts exceeds a predetermined minimum.