I have created and developed an App and it has a registration page, Now let me rephrase in detail:
Registration will make an entry in DB through API call and suppose at sometime user delete the app since I dont have any uninstall listenner so the data is still present in DB and at registration there is a validation that no two users can have this same number since this user tries to register again then it will prompt him that user already exist like message which I am displaying because I dont want two device to get the same number.
Please tell me something to resolve this so that user acknowledges its device suppose I am sending mac-address along with it. Would it help?