After getting your SIM card at TPE airport, here is how you can get to Chiayi City:
- Follow the direction to take Taoyuan Airport MRT
- Get off at A18 Taoyuan HSR station
- Buy HSR ticket and hop on HSR train to Chiayi
- You will be in Chiayi HSR station after 1.5 hours
- Take a taxi to your destination in Chiayi for about NTD 100 per person
- Or take the free shuttle bus to Chiayi city center by presenting your HSR ticket
Step 1-2, please refer to this MRT map to navigate: