There are two use cases for which your phone number is required:
- It allows us to quickly get in touch with you if we suspect a fraudulent use of your account
- It will be asked in order to set up the 2FA Validation.
- It makes 3-D Secure protocol possible (i.e. the sending of a confirmation code for online purchases).
For these reasons, it is very important that you make sure that your contact details are always up-to-date in your user profile (learn how to update your information).