Using deviceUniqueIdentifier on iOS 14

Hello,

We use deviceUniqueIdentifier as an id for users in our game. By unity doc:


iOS: on pre-iOS7 devices it will return hash of MAC address. On iOS7 devices it will be UIDevice identifierForVendor or, if that fails for any reason, ASIdentifierManager advertisingIdentifier.


Right now it means that if we use that field before the App Tracing Transparency aler we might be accessing idfa without users consent, also does this mean that if users reject there might be multiple users with same unique identifiers: 00000000-0000-0000-0000-000000000000, which is the default idfa if users reject the tracking?

Thanks.

 

Do not ID your players with deviceUniqueIdentifier. Any jailbroken device can change the outcome of that method.

 

Yeah we are aware of that, but we are using some legacy code, and we have a relatively huge userbase, so a change to something else would be time consuming and almost impossible.

Also please, can anyone answer the couple of questions i've asked in the post above?

 

Use UnityEngine.iOS.Device.vendorIdentifier for [UIDevice identifierForVendor] if you want to avoid accessing IDFA.
https://docs.unity3d.com/ScriptReference/iOS.Device-vendorIdentifier.html

Also refer to the Apple Documentation for the actual behavior of that API:
https://developer.apple.com/documentation/uikit/uidevice/1620059-identifierforvendor

 

Hello Petras,

Thanks for the answer, we are using 2018.4, and migrating to 2020.2 is certanly an option, but its not an lts version and it would require some work, due to certain things being depreciated, like .net scripting backend for uwp.
Would the behaviour i described in my first question be present in 2018.4, which is an lts version of unity and the one that we use?
We are aware of better solutions for uniquely identifing our users, but also we are maintaing an app with a huge legacy codebase and a lot of active users, so changing something like that would be a huge task, also losing progress after uninstalling is intended, so its not a concern of ours.

Thanks a lot for the answer.

 

Is it safe to use this one then? https://docs.unity3d.com/ScriptReference/iOS.Device-vendorIdentifier.html
I think it will not change right