This is the part where my mom would mention party lines.
In some rural areas there was something like not every house had a unique phone number, but as a side effect you could just pick up the phone and talk to all the people on that same party line at once.
As an old: You kids and your TeamSpeak … back in my day Ventrilo, and we were happy to have it! (uphill both ways or something about my lawn).
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This is the part where my mom would mention party lines.
In some rural areas there was something like not every house had a unique phone number, but as a side effect you could just pick up the phone and talk to all the people on that same party line at once.