Phone jacks and plugs are connectors used with telephones and other audio systems ... The RJ-11, the most common type of telephone jack, can have six conductors but is usually implemented with four.

so just grab a USB hub and charge your phone and you headphones or what have you. Now, though, we have USB Type C, with Power Delivery. Theoretically, we can pull 100 W over a USB cable.

RJ-11 Registered Jack 11 is a four or six wire connector used primarily to connect telephone equipment in the United States ... attached to a cable or removable sub-assembly. In shell-type, ...