c# - When is device unique id the same on windows phone? -

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i'm building application using push notifications, want possibility send "test" message's phones. don't know phones @ launch. way solve using "deviceuniqueid" , using second app retrieve name. read questions can change, example when app published different publisher.

so question is:

when deviceuniqueid same , when different?

for wp 7.1 apps running on wp 8 devices value of deviceextendedproperties("deviceuniqueid") unique across applications , not change if phone updated new version of operating system.

for wp 8.0 apps running on wp 8 devices value of deviceextendedproperties("deviceuniqueid") unique per device , per app publisher.

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