A holder for a mobile phone includes a body having an opening to receive the mobile phone and having a bottom. The holder further includes a latch coupled to the body for holding the holder with the opening up; and includes rear walls, side walls and a front wall that includes an opening that corresponds to the screen of the mobile phone and includes a mechanism to force the mobile phone to press against the front wall to create a cavity of air between the rear of the mobile phone and the back of the holder, where the top of the cavity is open to allow sound to propagate from near the bottom of the mobile phone through the top thereby amplifying the sound making the sound propagate primarily in an upward direction. The holder also has a clip mechanism feature that uses upward tilted teeth that bite on the front side of a seat belt to allow secure holding even when the user is withdrawing their mobile phone from the holder.