I'm building an application that is using push notifications, but I want the possibility to send "test" message's to certain phones. I don't know which phones it will be at launch. The way I would like to solve this is by using the "DeviceUniqueId" and using a second app to retrieve it with an name. But I also read questions that it can change, for example when the app is published by a different publisher.
So my question is:
When is the DeviceUniqueId the same and when is it different?
For WP 7.1 apps running on WP 8 devices the value of DeviceExtendedProperties("DeviceUniqueId") will be unique across all applications and will not change if the phone is updated with a new version of the operating system.
For WP 8.0 apps running on WP 8 devices the value of DeviceExtendedProperties("DeviceUniqueId") will be unique per device and per app publisher.
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