I am traveling to Taiwan soon. How can I use the Internet cost-effectively? Can I buy a mobile phone card?

You can apply at the airport with your Taiwan Entry Permit. Some operators may require double documents (Taiwan Entry Permit + Travel Permit). Telecom companies' airport locations are originally targeted at tourists. If you leave the airport and still need to apply, you have to go to a directly operated store.

There are two types of mobile Internet access, one is relying on the system of the telecommunications company, and the other is wifi. What we call Internet access now refers to the former, commonly known as 3G mobile Internet access in Taiwan. For short-term tourists, operators have launched different 3G mobile Internet plans. You can choose according to your needs and budget. However, remember that the 3G used by Taiwan's three major telecom operators is WCDMA. You must first make sure that the mobile phone you carry supports the WCDMA specification, otherwise you will not be able to use the card after buying it.