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Definition: mini-phone connector
Also commonly called a 3.5mm connector and 1/8" connector, the mini-phone connector is a plug and socket widely used for analog audio signals in portable devices. For example, the headphone jacks on earlier cellphones and smartphones, tablets and portable DVD players are 3.5mm mini-phone sockets.
3.5mm Mini-Phone to USB C
In the mid-2010s, the USB Type C jack began replacing 3.5mm mini-phone jacks on smartphones, tablets and other portable devices. See USB-C to 3.5mm adapter.
2.5mm Sub-Mini
The smaller "sub-mini connector" with a thinner shank (2.5mm - 3/32") has been used on earlier cellphones and other compact devices. See phone connector, RCA connector, A/V ports, Lightning to 3.5mm adapter and plugs and sockets.
You Can Tell By the Plug
3.5mm Mini-Phone to USB C
In the mid-2010s, the USB Type C jack began replacing 3.5mm mini-phone jacks on smartphones, tablets and other portable devices. See USB-C to 3.5mm adapter.
2.5mm Sub-Mini
The smaller "sub-mini connector" with a thinner shank (2.5mm - 3/32") has been used on earlier cellphones and other compact devices. See phone connector, RCA connector, A/V ports, Lightning to 3.5mm adapter and plugs and sockets.
Plugs with two divisions (TS) are monaural, while three divisions (TRS) are stereo. Headset plugs have a fourth line (TRRS) for the microphone. Smartphones accept both three-wire cables for headphones and four-wire cables for headsets. See tip and ring.