What should I do about my DTV when I change my passport?

When you change your passport and need to update your DTV (Digital Tourist Visa) in Thailand, you should keep both your old and new passports. At immigration, you can show both passports along with your DTV. If you need to transfer the current stamp from your old passport to your new one, you can visit the immigration office. It's a straightforward process, often taking just a couple of minutes during your entry.