Plug in the earphones before playing music.This is under the assumption you're using the earbuds that came with the iPhone.
when i select a song to play the music comes out of the bult in speaker of the iphone. when i insert earbuds into the 3.5mm jack the music still comes out of the built in speakers and not the earbuds. any solutions?
using a pair of bose earbuds... still not working