on iphone, can't change volume by volume button,when press the volume button,comes out the bell sound????

  • hi guys, just as the subject said,on iphone,i don't upload the m4a audio file,so there is no voice when playing it,but when i pressed the volume button,it's not changing for the volume,but for the bell.

    anyone can give me some suggestions?
    thx!

Participate now!

Don’t have an account yet? Register yourself now and be a part of our community!