Technical points: A recorded phone call contains (typically) a fair bit of distortion and is generally low in fidelity. If it's a digital recording, it may also be using a very lo-fi sampling rate that will make everything sound bad, and not necessarily resemble what people hear when they hear your voice, live and in person. If you can get an example of the file, in fact, you might want to share the specs (sampling rate in Hz, bit rate, any other details that may appear as part of the file specifications).
If you don't do good quality recordings of your voice from time to time, and are still working to improve your voice, you might want to make a habit of recording and listening, in part to desensitize yourself, and also as a means of improving the feedback and improvement that will come from closely listening to how you present yourself.
Long ago, I worked as a radio news announcer (in boy mode). I hated listening to my recordings, only in part because of my dysphoria... a big part of it was also the dissonance of listening to a recording of myself, versus the sound I was more accustomed to, affected by all the factors that make listening to yourself (in your head, not in replay of a recording) so very different from what anyone else will hear.
