the control center received a significant redesign in ios 11, unifying its different pages into one and allowing users to 3d touch (or long press on devices without 3d touch) the icons for additional options, and vertical sliders allow users to adjust volume and brightness. the control center is customizable via the settings app, and allows for a wider range of settings features to be shown, including cellular service, low power mode, and a shortcut to the notes app. these changes are still present in the current stable release of ios 12.