Mobile technologies have been described as 'boundary' objects which enable teachers and learners to transcend many of the barriers such as rigid schedules and spaces which have hitherto characterised traditional forms of education. However, educators need to better understand how to design learning scenarios which genuinely exploit the unique pedagogical affordances of mobile technologies rather than replicating existing patterns and modes of behaviour. This article describes the design and development of a mobile learning toolkit for educators to realise this vision. It presents the theoretical underpinnings for the toolkit and describes the development of different tools, instruments and resources. The main aim of the toolkit is to help teacher educators and teachers build knowledge and understanding of more diverse mobile pedagogical approaches.