If you were born after wifi, the dial-up modem noise is what electronics used to sound like: dated, from the era of the fax machine and the non-customizable ringtone. To me, it’s more than that. The ...
Look in your sound control panel. There might be something about "Modem WAV Out". Mute that and it should turn off the sound. Ifound out that sometimes look at your settings in your ISP. For example, ...