Here are 2 ways to activate your VISA Debit Card for overseas usage:
1. Visit a Post Office:
    Please bring your national ID card, passbook, and authorized seal in person to any post office.
    A foreign national must present an Alien Resident Certificate (ARC); if no ARC, a passport and a  
    Record of ID No. in the Republic of China are required. For branch-limited account holders,
    please  visit your home branch.
    
2. Go to the Nearest Postal ATM, Log into WebATM or POST APP:
    Please Note:
    If there’s no cardholder name on your card, activation at a Postal ATM is not applicable.  
    

To meet your spending needs, you can temporarily increase your purchase limits, or permanently decrease your purchase limits:
1. Decrease purchase limit up to maximum of NT$20,000 per transaction/day and the monthly limit
    up to NT$100,000；Increase purchase limit up to maximum of NT$150,000 per day and the
    monthly limit up to NT$200,000.
    (1) Apply at a Branch:
          You need to provide your national ID card, passbook, and authorized seal in person to any
          post  office.
          A foreign national must present an Alien Resident Certificate (ARC); if no ARC, a passport and
          a  Record of ID No. in the Republic of China are required.
          For branch-limited account holders,  please visit your home branch.          
    (2) Contact Customer Service Center:
          Just call our 24-hour toll-free hotline: 0800-700-365 to speak with a customer service officer.  
          (from a mobile, please call: 04-23542030; from overseas, please call: +886-4-2354-2030.)
    (3) Log into WebATM or POST APP:
          You may adjust purchase limits via WebATM equipped with a card reader or POST APP.

2. Increase purchase limit up to maximum of NT$150,000 per day; no monthly limit.
    Only applying in person is allowed. You need to provide your national ID card, passbook, and  
    authorized seal in person to any post office. A foreign national must present an Alien Resident
    Certificate (ARC); if no ARC, a passport and a Record of ID No. in the Republic of China are
    required.  For branch-limited account holders, please visit your home branch.

Please note:
After limit increase, the maximum purchase limit per transaction still remains NT$60,000.
Temporary limit increase will be valid for 30 days from the application date. Permanently limit decrease will be invalid after the card is replaced.

You can temporarily increase your overseas withdrawal limits in the following ways:
1. To increase the daily limit up to NT$100,000; the monthly limit up to NT$300,000:
    (1) Apply at a Post Office:
          You need to provide your national ID card, passbook, and authorized seal in person to any
          post office.
          A foreign national must present an Alien Resident Certificate (ARC); if no ARC, a passport and
          a  Record of ID No. in the Republic of China are required.
          For branch-limited account holders, please visit your home branch.
    (2) Contact Customer Service Center:
          Just call us 24-hour toll-free hotline: 0800-700-365 to speak with a customer service officer
          (from a mobile, please dial: 04-23542030; from overseas, please call: +886-4-2354-2030).
    (3) Log into WebATM or POST APP:
          You may increase overseas withdrawal limits via WebATM equipped with a card reader or POST
          APP.
2. To increase the daily limit up to NT$100,000; no monthly limit:
    Only applying in person is allowed. You need to provide your national ID card, passbook, and
    authorized seal in person to any post office. A foreign national must present an Alien Resident
    Certificate (ARC); if no ARC, a passport and a Record of ID No. in the Republic of China are  
    required.For branch-limited account holders, please visit your home branch.

Please note:
After limit increase, the maximum overseas withdrawal limit per transaction still remains NT$20,000.
Temporary limit increase will be valid for 30 days from the application date.

If you find a suspicious charge, a payment amount error, or a certain unfamiliar transaction on your statement, please call our customer service center toll-free hotline: 0800-700-365 to speak with a customer service officer (from a mobile, please dial: 04-23542030; from overseas, please call: +886-4-2354-2030). Alternatively, you can visit a post office with your receipts or other evidential documents within 30 days after the day the current statement is sent.

Renewal application should be done 3 months prior to the card’s expiration date. There are three ways for card renewal:  
(1) Applying in Person:
      Visit any post office near you with required application documents (for branch-limited account
      holders, please visit your home branch). See How to Apply for a Postal VISA Debit Card for
      required application documents.
(2) Online Renewal:
      You can renew your card either on our website (select VISA Debit Card, click Online Renewal),
      iPost, POST APP or WebATM.
(3) Auto Renewal:
      If you are eligible for Visa Debit Card Auto Renewal, you do not need to submit a renewal
     application. Your card will be automatically renewed and mailed to your registered address two
     months before it expires.