You can continue to use the same Expo ID even if you change your device. If you have set up "One-time Password Authentication (email)" as your identification verification method, you can log in and verify your identity without having to make any special settings.
For more information, please refer to section 3:"Using a Different Smartphone Model" in the Expo ID Problem Solving Manual.
ExpoID Problem Solving Manual:
https://www.expo2025.or.jp/wp/wp-content/themes/expo2025orjp_2022/assets/pdf/tickets-index/id_problem_solving_manual_en.pdf

If you have changed your email address following a device change, you will need to contact us to change your email address. Please contact us via "Enquiries about admission tickets and Expo ID registration" below.
Enquiry form:
https://faq.expo2025.or.jp/hc/ja/p/contact