If you still have the app
Open Settings → Delete account. Re-enter the number linked to your signed-in mailbox and confirm. No extra SMS code is sent for that in-app step.
The in-app option is the quickest way to request deletion. This page is here if you can no longer use the app.
If you no longer have the app
Email our privacy team with the subject NumberInbox account deletion request. Tell us the phone number linked to the mailbox in international format, such as +66812345678. Do not send passwords, verification codes, or message contents. We will reply with a safe way to verify account control before deletion.
This opens a draft in your email app. Send the email to complete your request. If the draft does not open, write to privacy@numberinbox.com.
What happens next
After verification, we delete the mailbox, messages, and associated app credentials from active service storage. We confirm when the request is complete. Backup copies are not removed immediately and expire under our operational backup schedule. Contact us for the current retention period. A later message sent to the same number may create a new, empty mailbox; deleted messages do not return.
Entering somebody else's phone number does not delete their account. We verify account control before processing a request.