Around April 20, 2011, a hidden unencrypted file on the iPhone and other iOS devices was widely discussed in the media.[231][232] It was alleged that the file, labeled "consolidated.db", constantly stores the iPhone user's movement by approximating geographic locations calculated by triangulating nearby cell phone towers, a technology proven to be inaccurate at times.[233] The file was released with the June 2010 update of Apple iOS 4 and may contain almost a year's worth of data. Previous versions of iOS stored similar information in a file called "h-cells.plist".[234]