For iOS, even if it exists, using such an ID that’s against the license terms. https://developer.apple.com/support/terms/apple-developer-program-license-agreem

For iOS, even if it exists, using such an ID that’s against the license terms. https://developer.apple.com/support/terms/apple-developer-program-license-agreement/ https://developer.apple.com/support/terms/apple-developer-pr...: “Neither You nor Your Application will use any permanent, device-based identifier, or any data derived therefrom, for purposes of uniquely identifying a device. And neither You nor Your Application will derive any data from a device for the purpose of uniquely identifying it or a user.”