Unique Identification of iOS device for iOS 7.0 and above

Question

Looking for your help

I am facing a problem while getting Device Identifier. Actually I am using a UIDevice+IdentifierAddition.h, NSString+MD5Addition.h classes to get Identifier, but its return same identifier for all my devices i.e. iPhone 4s (iOS 7.1) & iPhone 5 (iOS 7.1.1).

Can any one have any solution for this problem. because I want a something unique for device specific. its my app requirement.

Important: I want to submit this app on app store, So please, answer must be as per the guidelines

Answer 1

Since iOS 7 it is no longer possible to get any unique device identifiers.

Your options are:

• create your own unique ID and save it in the keychain.
• use the vendor ID, which will be reset if all the app by the same vendor are removed from the device.

Answer 2

Now it's possible in iOS 11.0+, Apple has introduced a new API called DeviceCheck API with which developers can uniquely identify a device.

As mentioned in the documentation:

Using the DeviceCheck APIs, in combination with server-to-server APIs, you can set and query two bits of data per device, while maintaining user privacy. You might use this data to identify devices that have already taken advantage of a promotional offer that you provide, or to flag a device that you have determined to be fraudulent. The DeviceCheck APIs also let you verify that the token you receive comes from an authentic Apple device that includes your app.

Also, check out the following WWDC17 video starting at 24 min: https://developer.apple.com/videos/play/wwdc2017/702/

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EDIT:

A thoroughly detailed tutorial on this Device Check topic can be found here.