In the countries of the global South, the challenges of fixed infrastructure and environment, the apparent universality of mobile hardware, software and network technologies and the rhetoric of the global knowledge economy have slowed or impoverished the development of appropriate theoretical discourses to underpin learning with mobiles. This paper addresses one specific and fundamental component of such discourses, namely the role of language and literacy as they interact with mobile technology. The paper makes three points, that mobile technology is culturally and linguistically specific, not universal or culturally-neutral; that mobile technology does not merely store and transmit language(s) and literacy within communities, it disturbs and transforms them, and that the digital literacy agenda that might underpin learning with mobiles has not yet been developed in relation to mobile technology or in relation to the global South. These are the foundations of understanding learning with mobiles in the global South.