ScriptReference/SystemInfo-deviceUniqueIdentifier

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ScriptReference/SystemInfo-deviceUniqueIdentifier

https://docs.unity3d.com/ScriptReference/SystemInfo-deviceUniqueIdentifier.html

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Comment by @tenpn:

On Android it attempts to use the device ID if the telephony permission is available, then the android ID, then the mac address, but there's some complexity outlined here.

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Comment by @tenpn:

On iOS the identifierForVendor can change if all vendor apps are uninstalled. If you're not using the value for advertising, you can consider storing the value in the device's keychain on first install and retrieving from there on subsequent installs.