Developing iPhone Application with Entertainment domain and what to implement that when user download my app from app store will be free for limited period and after that if user got satisfy with the app then need to pay money for continue using. We can say that firstly user is downloading the trail app and after that user need to pay some charges for full version.
So is there any way to implement this with iPhone Application ?
Developing iPhone Application with Entertainment domain and what to implement that when user download
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No, since there is no way to check 100% whether the user has previously installed the app. Thus when the user reinstalled the app the time trail would start again. You could save the install start time of the trail in the keychain to make it more persistent. But still clear my iPhone will make me be able to start the trail again.
You would be better of limiting the user in, for example, in the number of item you could save in the app. And add an in app purchase to unlock all the features.