Your mom can hear the eye-roll through the phone. Tone travels further than you think.

Tone survives a phone line better than people assume. Your face changes the shape of your mouth, so an eye-roll or a flat stare arrives as a particular kind of flatness in your voice, and your mom has been hearing that version of you for sixteen years. What you thought was private got broadcast.

Assume whatever you are doing with your face is being delivered. If you are irritated, say so in words rather than letting it leak, because words can be answered and a leak cannot. And when you are glad to hear from somebody, that travels too.