The music is very pretty and well made! I like the way it swells almost endlessly it seems before falling back down again.
I think there is room however to use music instead of dialogue. The entire first "track" isn't really a song as much as it is a part of the story itself. I think some dialogue is ok, but I want to hear how you connect it to the music. Have the track play around with the cell phones call noise in a track. Use the buzz of the call as the tempo and beat. Things like that so it doesn't feel as segmented between story and music.