Mobile technologies are becoming ubiquitous in education, yet the wider implications of this phenomenon are not well understood. The paper discusses how mobile lifelong learning (mLLL) may be defined, and the challenges of forging a suitable definition in an ever-shifting technological and socio-economic landscape. mLLL appears as a ubiquitous concept that puts together mobile learning, essentially an ensemble of didactic practices based on the use of mobile technologies, and lifelong learning, a general vision of education in the knowledge society. Starting from the results of an EU-funded project, MOTILL, the paper situates mLLL within the more complex framework of the network society. This illuminates the difficulties in formulating a comprehensive definition, but also the relevance of this concept in the future of learning. We conclude that the future of mLLL can be understood only as a 360 degree vision that is able to take into account a range of pedagogical, managerial, political and ethical issues.