1. A computer-implemented method comprising: providing, by a mobile computing device, a first user interface indicating that (i) a voice training mode is active, and (ii) a voice training sample is to be spoken by a user; before the voice training sample is spoken by the user, automatically providing, by the mobile computing device, a second user interface indicating that (i) a background noise indicator mode is active, and (ii) a background noise loudness satisfies a loudness threshold or a background noise variance satisfies a variance threshold; and upon determining that the background noise loudness no longer satisfies the loudness threshold and the background noise variance no longer satisfies the variance threshold, enabling, by the mobile computing device, a selectable control that is configured to, upon selection by the user, provide the first user interface.