This is directed to rotating an entire user interface of a portable electronic device. In particular, this is directed to defining a UI orientation mode in which a user can direct the device to rotate a UI. When the UI orientation mode is enabled, the electronic device can detect particular inputs, for example based on the outputs of motion sensing components such as an accelerometer and a magnetometer, to determine how to rotate the UI. Once the UI has been rotated to a desired orientation, a user can lock the UI orientation and exit the UI orientation mode.