The inability of an electronic reading device to synchronize its data, such as ebooks, bookmarks, and last page read, with a mobile telephone represents a functional disconnection. When this occurs, progress made on one device is not reflected on the other, leading to a fragmented reading experience. For example, a user may read several chapters of a book on their e-reader but, upon opening the same book on their phone, find that it opens to the beginning or a previous location.
The seamless transfer of reading data between devices is crucial for maintaining reading momentum and providing a consistent user experience. This functionality allows individuals to switch between devices based on convenience, location, or battery life, without losing their place in a book. The initial design of interconnected e-reading ecosystems prioritized this synchronization to enhance reader engagement and provide flexibility in how and when individuals consume digital content.