Is mobile TV “mobile” or “TV”? To make the question more precise, under which regulatory regime should mobile TV service be licensed (or regulated)? Television regime or telecommunications regime? Well, the answer all depends on which country where mobile TV service is licensed. However, as a matter of fact, a vast majority of countries in the world still do not have a comprehensive regulatory framework for mobile TV service. In the article, the author searches for the best answer for Taiwan. A study of the regulatory regime for mobile TV service in Italy, Finland, Canada and Hong Kong indicates four models: “total broadcaster”, “relaxed broadcaster”, “TV exemption” and “telecommunications” model, respectively. It is recommended that we adopt “deregulated broadcaster” model or “telecommunications” model for mobile TV service in Taiwan. The “total broadcaster” model is utterly unfit.