SystemInfo.deviceUniqueIdentifier
static var deviceUniqueIdentifier: string;
static string deviceUniqueIdentifier;
static deviceUniqueIdentifier as string
Description

A unique device identifier. It is guaranteed to be unique for every device (Read Only).

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.