Mobile services support the tourist during all trip phases and increasingly supplement traditional information services. Due to their ubiquity, mobile services offer access to relevant information and services anytime and anywhere. This paper presents a technical framework for implementing mobile services as well as an exemplary instantiation in form of a mobile winter guide for the ski resort DolomitiSuperski. The application of the mobile guide in the winter season 2008/2009 showed high usage rates, thus, approving the relevance of mobile services in the usage context winter destination as well as the effectiveness of the developed framework. The second part of the paper presents the results of a usage analysis and discusses determinants of user satisfaction and potential usage-barriers.