The field of mobile learning is at present characterised by a proliferation of pilots and trials that allow mobile technologies to be tested out in a variety of learning contexts. The sustained deployment of mobile learning will depend on the quality of these pilots and trials, which includes evaluation methodology and reporting. The paper examines current evaluation practice, based on evidence drawn from conference publications, published case studies, and other accounts from the literature. The authors also draw on their work in collecting case studies of mobile learning from a range of recent projects. Issues deserving examination include the apparent objectives of the pilots or trials, the nature of the evaluations, instruments and techniques used, and the analysis and presentation of findings. The paper reflects on the quality of evaluation in mobile learning pilots and trials, in the broader context of evolving practices in the evaluation of educational technologies.