Dear Team, For our application we are using NSUserDefaults to save and retrieve the user basic information in device storage. While transferring the application from one iPhone to another iPhone whole NSUserDefaults save data copied to other devices, due to this in another/new device user is able to use application without new/fresh registration. We required new/fresh registration when application is transfer from one iPhone to another iPhone. Please help in below quires. How to stop NSUserDefaults data coping from one device to another devices Is there is any other way to save data which will not copy to other device while app transfer using iPhone default feature. We are saving unique device identifier in Keychain. Is there any other best way to save unique device identifier in device which can remain same while app uninstall and in case of app upgrade. Thanks in advance.