Roll out purple fondant from Neon Multi Pack 1/4 in. thick. Cut a 1 in. high by 1/2 in. wide phone shape using knife. You can always adjust the measurements to whatever size you need.
Roll out black fondant from Natural Multi Pack 1/8 in. thick. Cut a dome-shaped screen with knife. Roll small balls of black fondant from Natural Multi pack for buttons. Roll a log antenna. Attach all pieces to phone with damp brush.