Because the conventional telephone network those old dial-up modems used was never intended to transmit binary data, with a maximum speed of 56 kbps, and we got better replacements. Therefore there is no need to install speakers in modems to check if the dialling is working, and the signals can no longer be heard with a phone.

- DSL (Digital Subscriber Line)

As an older internet connection, DSL still uses telephone lines, but it no longer dials a phone number or transmits with audio signals. The signals of DSL are in frequencies not used by phones, so they cannot be heard.

- Cable and Fibre

These connections don't use the phone lines, and the signals can't be heard.
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