A vehicle cup holder cell phone mount has a base with a downwardly and inwardly tapering surface of rotation around a vertical axis. A pier stands up from a top of the base and a cell phone mounting bracket is pivotally mounted to the pier. The cell phone mounting bracket has adjustable jaws to fit cell phones of varying widths. The jaws always define an opening for a cell phone power/communications cable. One or more of a plurality of shells may be selectively assembled to the base. Each shell has a tapering surface of rotation around the axis. The shells are of different sizes. The user assembles from zero to (n) shells to the base, Russian-doll fashion, so as to optimally fit a particular vehicle cup holder. The user then wedges the assembly into the vehicle cup holder such that compressive force between the outermost tapering surface and the cup holder side wall securely holds the cell phone mount in place in the vehicle cup holder.