UIQ (formerly known as User Interface Quartz) was a software platform based upon Symbian OS, created by UIQ Technology AB. It is a graphical user interface layer that provides additional components to the core operating system, to enable the development of feature-rich mobile phones that are open to expanded capabilities through third-party applications. Owned and developed by Sony Ericsson and Motorola, the user interface is now outdated and the software company UIQ Technology filed for bankruptcy on 5 January 2009.