Value-Added Tax (VAT) in Taiwan
Value Added Tax (VAT) is a 5% tax on goods and services that is paid to the Taiwanese tax authority. How and whether you pay VAT in Taiwan depends on your payment method and setting. Choose the method or setting that applies to your account below.

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3. Do NOT connect your main phone number, the one you protected via the steps above (unless it is managed by Google Voice), to any sensitive accounts.

via Hackers Are Hijacking Phone Numbers And Breaking Into Email, Bank Accounts: How To Protect Yourself