Conversation analytical methodology was used to specify the new opening practices in Finnish mobile call openings, which differ systematically from Finnish landline call openings. Since the responses to a mobile call orient to the summons identifying the caller, answers have changed and diversified. A known caller is greeted. The self-identification opening that was canonical in Finnish landline calls is mainly used for answering unknown callers, while channel-opener openings involve orientation to ongoing mutual business between the speakers. Some of these changes (...) reflect real-time coordination of the social action that the mobility of mobile phones enables. In all, the adoption of new ways of answering a call shows that people orient themselves to affordances that new technologies allow them. Mobile phone communication opens a salient new area both for the analysis of talk-ininteraction itself and also for understanding communicative behaviour in the era of ubiquitous information technology. (shrink)