Can You Use the Same Temporary Inbox on Phone and Computer?
Use one active temporary inbox across desktop and mobile during the same short task.
Quick answer
Yes. Device linking is designed so the same active temporary inbox can continue across your phone and computer after the second device is approved.
Two screens, one temporary inbox
The purpose is to avoid rebuilding the inbox or copying codes between devices when a signup starts on one screen and finishes on another.
Device linking keeps the task inside one active MailOnce inbox. The QR code is only a short request mechanism; access still depends on approval from the browser that already controls the inbox.
This is most useful when the task changes screens
A common case is starting a signup on a computer and needing the verification message on a phone, or the reverse. Linking keeps one short-lived inbox in play instead of making you juggle two addresses or send the code through another mailbox.
When this is useful
Use one inbox across devices for the same short task; remember that both devices still depend on the inbox’s temporary lifetime.
Try MailOnce
Move one active inbox between your own devices
Create a temporary inbox, then link another device only when your task genuinely moves from one screen to another.
Create temporary emailRelated device linking guides
Continue with the device-linking topics closest to what you just read.
How to Open the Same Temporary Inbox on Another Device
Continue with the inbox already receiving your messages instead of creating a second address.
Read guideHow QR Device Linking Works in MailOnce
Follow the request from rotating QR code to browser approval and access on the second device.
Read guideWhy Does MailOnce Require Approval After Scanning the QR Code?
Understand why a scan starts a request but the existing session still controls permission.
Read guide