You can apply for 4G prepaid card anytime at any 7-ELEVEN with your passport and visa, and enjoy 5 days for unlimited data usage. After that, you can always re-deposit for 1, 3, or 5 more days; the choice is yours.
4G Prepaid Card 5 Days for Unlimited Data Usage Plus 50 NTD Voice Call
3-in-1 SIM CARD (Mini/Micro/Nano) 6-month Valid
price NT$350 Able to be re-deposited