Nokia Lumia 800 - How do I undo my Lumia phone association with a Microsoft Account?

Important: Using the Remove this phone option on windowsphone.com will de-provision the phone from all Microsoft services, and require a hard reset before the phone can be used again.

To remove a registered device from your Microsoft account, please follow the steps below:

  1. Use a desktop browser, sign in to your Microsoft account by clicking on the link windowsphone.com.
  2. Once signed in, and then hover a mouse pointer over your name at the top right corner of the page.
  3. On the drop down menu, you will also see the list of devices that are registered on you Microsoft account.
  4. Select a device that you would like to remove.
  5. Once you have selected the device, move a mouse pointer over your name and then select Account Settings on the drop down menu.
  6. At the top left corner, you will see the name and model of the Windows Phone you would like to remove.
  7. Click on Remove this phone.
  8. Confirm the action by clicking on Remove on the pop-up window.

The back-end change to remove device association takes up to 72 hours to replicate through the systems.