Where should I get my SIM?

As a traveller, there's only 1 way you can get SIM: Airport package.

Why? If you wanna apply SIM at local telecom shops you need dual ID due to our law. Only if you got ARC or student card you can get a pre-paid or monthly bill SIM at local shops.

These are 3 major telecom in Taiwan: Taiwan mobile/Far Eastone/CHT. There's no big difference between them. The speed, singal are almost the same.

So... which one should I choose?

Choose the shortest line!!! Don't waste your time.

Also you can use KKDAY/KLOOK to book a SIM in advance. These 2 apps are quite useful around Asia.