Multimodality will be introduced in stages. When performing functions, multimodal devices will initially move between modes of interaction such as visual, voice and touch. This sequential process will restrict mobile devices to a single mode of input at any single time. As next-generation networks and devices are adopted, multimodal devices will allow simultaneous modes of communication. Known as boundless multimodality, this technology will enable more advanced application development. Reducing churn and differentiating carriers, Multimodality will also increase the popularity and use of value-added mobile applications (Datamonitor, 3/2002).