How does the device knows an app is installed before?

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                          Some apps gives premium support for some limited time. If I uninstalled and installed it next time I couldn't get the same features. How does the application keeps a record of the device? And is it possible to prevent it?
                        

Asked by Sarath (11 rep)

Jan 13, 2015, 03:07 PM
Last activity: Jan 13, 2015, 03:15 PM

How does the device knows an app is installed before?

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