With the second highest penetration rate in the world-over 100% - Taiwan's telecommunications services market is highly developed. In such a saturated, oligopsonistic market, there is great competition between providers to steal each other's customers. Mobile telecommunication services have therefore raised switching costs in an effort to dissuade users from switching providers, an issue every industry takes very seriously. In the past there has been a great deal of research into the influence different types of switching costs have on users' intentions to switch. But there is a difference between the types of switching cost consumers of different industries are aware of and the relationship these different types of switching costs have with users' intentions to switch. Taking demographic variables into account, this research conducted quota sampling of Taiwan's mobile telephone users, collecting data from 229 users. With the use of linear structure equations, we have proven that procedural and relative switching costs have a significant relationship with users' intentions to switch, but that financial switching costs have little effect.