Steps to update your phone number on the Vividi app:
1. Open the app and tap your profile icon.
2. Tap the settings icon on your profile page.
3. Under Account & Security, tap Phone Number
4. Tap Update Number
5. Enter your new phone number and click Get Verification Code
6. Enter the code and click Confirm
Please note that if you change your phone number without updating it first on the app, you will be unable to access your account.
In such a situation, to continue using Vividi, you will need to create a new account using your new number.