Book excerpt: Mobile technologies have provided faster access to information and communication and at the same time also challenging libraries to rethink and remodel their service by adopting technological changes since mobile devices has become an essential part of people's lives. Mobile devices revolutionized communication and changed the pattern in which information is been accessed, information can be accessed using mobile devices anywhere anytime in a convenient and timely manner. As these new devices such as smartphones, tablets, and e-book readers are already part of the mainstream and adequately utilized in various types of libraries in developed nations of the world, libraries of developing nations such as Nigeria must do the same by adopting and implementing mobile technologies in Nigerian academic libraries, since the advantages have been known to be enormous and research has shown that library patrons prefer to access information over Mobile devices.With students, librarians and libraries in mind, this text explains mobile technologies, its application, origin advantages, status, various examples and the newer methods of information delivery using mobile technologies adopted in developed nations of the world, Mobile databases, catalogs, applications.it also describes the present status of mobile technology adoption in Nigerian academic libraries, challenges and way forward.