To change, delete or add a phone number to your account, open the Wero app and tap the 'accounts' tab. Next select your account and tap the 3 dots at the top corner. Then tap "delete or add a new email address or phone number to the account".
If you are using Wero within your bank's own banking app, please reach out to your bank to inquire how to change or add a phone number linked to your account.