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This paper discusses issues associated with improving usability of user interactions with mobile devices in mobile learning applications. The focus is on using speech recognition and multimodal interaction in order to improve usability of data entry and information management for mobile learners. To assist users in managing mobile devices, user interface designers are starting to combine the traditional keyboard or pen input with "hands free" speech input, adding other modes of interaction such as speech-based interfaces that are capable of interpreting voice commands. Several research studies on multimodal mobile technology design and evaluations were carried out within our state-of the art laboratories. Results demonstrate feasibility of incorporating speech and multimodal interaction in designing applications for mobile devices. However, there are some important contextual constrains that limit applications with speech-only interfaces in mobile learning, including social and environmental factors, as well as technology limitations. These factors are discussed in detail.