Mobile information services are gradually supplementing and may in the future even replace traditional information sources to support tourists during on-site stay. The scope of the paper is to identify already in the pre-prototype phase types and functionalities of mobile information services which are most relevant to tourists during their urban destination stay (Davis & Venkatesh, 2004). For this aim a user-centred approach using, both, focus groups and expert surveys is proposed. In addition, multiple regression based on acceptance data gathered from 705 tourists allow the deduction of potentially accepted mobile information services targeted to the specific destination use. Finally, by drawing on these results, both, the architectural framework as well as the various building and implementation steps of a mobile tourist guide called innsbruck.mobile are discussed