I've always felt when I talk to people who don't know me on the phone, they don't know if I'm a boy or a girl, but lately I've been getting "sir" a lot more, and no complaints from me. In person I think if people look at me and think then male my voice passes, but if they are confused I think my voice leads them to believe I'm a girl. Oh well though, it makes a boy feel good to know I have a chance to pass on the phone haha