# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2017-04-24 01:38:30 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/856321420409937921) RT @nicklockwood: Ah, that explains it. The issue was that Uber used a private framework (IOKit) to get the device serial number to track r…