This paper♠ presents an IoT client tier design and its setting within the multi-tiered architectural structure of EMULSION, the newly proposed horizontal-type IoT platform. Besides briefly outlining the key rationale for this IoT platform paradigm, design details are presented on the client and personal assistant applications proper to the client tier, which, in practice, are usually installed on the mobile devices of consumers, and which facilitate their effective use of IoT services by considering the current consumer- and environmental context so as to avail of the 'best' service instances under the ABC&S communication paradigm.