iphone - "Push notification" - feedback, uninstall application -
apple push notification - feedback service
how know when user uninstalls application? can remove devicetoken push server.
you don't know. can grab device identification string presumably identical same application token string, , track if token has changed specific device. can update device token new one, there no way find out if app removed device.
update: correct. can information feedback service, there caveat. need have @ least 1 push-messaging enabled application installed maintain persistent feedback connection. i'd mark these customers potentially non-existant, wouldn't remove these folks customer db. knows why push message can rejected. device may in inconsistent state , remove subscriber forever. if have 10k zombie clients pocket change db. if lost 100k clients have serious problems that.
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