The app has English, website doesn’t.
This is unlimited plan link 永不綁約 | 無框行動
You can maybe use Google translate. Here is a few steps that may help.
You can try putting that cow promo for discount.
Click right option if wanting new number, left us wanting to keep same number.
You’ll have to upload arc and then can choose second document like passport (passport is last selection in list).
Then choose which 7-11 or home to send it to.
Then add where you live.
On the next screen you review and pay. Note there is a one time 200ntd fee for shipping and activation.
If setting up auto payment with cc (international also ok), you get discount (I think.I forget if it’s this or other account I’m thinking of).