We will begin by exploring both the affordability and affordances of mobile technologies for the teaching and learning of language and literacy, and look at the kinds of learning contexts where mobile devices can play a role. We will go on to consider the learning outcomes achieved with mobile devices. Assessment and feedback can both be enhanced by mobile devices. However, while there is considerable promise for the recording, monitoring and evaluation of learning in mobile projects, and especially for the deployment of learning analytics, this promise is often unrealised for a variety of practical and pedagogical reasons. On the one hand, we need to seek more hard data on improved learning outcomes in mobile projects; and on the other hand, we may need to consider the notion of outcomes more broadly. We will conclude by looking at a number of mini-case studies of mobile language and literacy interventions from across Asia, asking in each case what evidence we can see of improved outcomes, and what we can learn for future projects.