If you want to travel in Taiwan, and you dont know how to calculate the charge for taking taxi. This app will be a good tool for you, you just input the starting point and destination , and it will calculate the charge for taking taxi. It also show you the routing map and show you the way how to go.
If you want to call a taxi , you could chose city or county, and chose one of the list which is close by. You could call out directly by your phone.
If you are at some special place or famous sight, the taxi will not charge normally , I may charge by bargaining. So you could use this app to calculate first, than you will know the normal charge. You will get more idea on bargaining.