This chapter describes aspects related to the design approaches and innovative learning activities of the research projects, and also illustrates the problem of sustainability and scalability of educational technology innovations with examples from the Swedish educational context. The research projects on mobile learning have been conducted in both formal and informal learning settings. The factors that can be regarded as both barriers and supports for the sustainability and scalability of technological innovations in Sweden are technology, and partnerships. A geometry mobile (GEM) project is an ongoing mobile learning project in the field of mathematics trying to find alternative ways to support the learning of geometry. The chapter presents a math education and playful learning (MULLE) project to introduce mobile learning activities in primary schools. It pays attention to the role played by research, and the resulting knowledge base, both at national and international level.