There are telecommunication industry and information industry to cost altogether, that is to communicate with each other according to industry development and technological gradual progress and fit Technological standardization, make the industry must use the fast development in the manufacturer, make the convergence of each boundary-less.Moreover different operation key different from resource foundation to can form difficult entry-barrier that cross over also ability way accumulated. Taiwan¡¦s ICT with the technological follower type, but with pursuing while growing up under large ship of the fast gradual progress of technology, how to adjust strategic resources, Represent brand-new institutional framework to create biggest customer's value with the business activity, it is a key topic.This research probes the mobile telecommunication industry, and base on digital-converge progression, focus on the enterprise behaviors produced under the third generation of mobile telecommunication data services and innovated. And Selected Key companies to analyze separately under the extension environment from competition advantage and Merger & Acquisition, and study through the description of the case. The result of study is found as follows: 􀁺 Three kind of convergence triggering business model changed. 􀁺 New technology of telecommunication created new mobile services. 􀁺 Strategical merger and acquisition changed telecommunication industrial structure.