A screen retention system for mounting of smartphones, tablet computers and other flat screen displays. A screen display is held against the inner surfaces of the opening of a semi-rigid arc by a post extending from the inner surface of the arc toward the opening. A screen based device may be inserted into the arc and retained within the opening by contact between the pressure plate and the opposing ends, thereby securing the screen based device within the arc by three points of pressure, at least one point of pressure supporting the screen based device against the inside surfaces of the opposing ends.