I haven't actually had an experience on the phone where I haven't already known the person or immediately introduced myself as Andrew, or I'm just not gendered at all (which is most often the case, for me). I'm 5.5 months on T now, so I'm figuring I'm up for at least one more voice drop at some point, but if it stays where it's at right now I'm actually okay with that, it's deep enough that it passes. I know plenty of cis guys, middle aged, with higher voices than mine. It's a little pubescent still, since it's so fresh from the last drop, but on the phone or in voice recordings I just sound like a 17-19 y/o guy.