We hate to see you go
If you are using an Apple mobile device, the following iOS app will help locate your IDFA: https://itunes.apple.com/us/app/the-identifiers/id564618183
If you are using an Android device, To locate Android ID, you must install the “Device ID” app from Google Play. To download, click here.
If you are using a device that is not on an Apple or Android operating system, we are not able to instruct you on how to find your Device ID at this time. Please check back with us, as we are continually working on enhancing tools for user choice.