About three years ago, I upgraded my mobile to an Alcatel job (still Android though) and found that I could no longer play music through the aux. 3.5mm socket. Anyway, to cut a long story short, the Alcatel got soaked one night, went kaput and I ended up going back to Huawei again. Music once again played throgh the aux. socket.
I seem to remember reading somewhere that some phones (including Alcatel) will not play audio if they do not detect the correct headphones / output device being connected. Don't know how that works but there could be something in it.