Your phone number is the primary identifier of your account and cannot be changed.
If you have a new phone number, you're required to create a new PayByPhone account. If your previous phone number is no longer in use, we advise that you delete the old account.
Delete Your PayByPhone Account:
Login to your account at https://paybyphone.com/receipts with your phone number and password.
Click the Profile button and scroll to the bottom of the page, click Delete Account.
Check "I want to delete my account" and then the Delete Account button one last time.
Note: Once you close the account, your transaction history will be unavailable: please print any receipts that you might need prior to deletion.