![](http://www.clanofidiots.com//images.eurogamer.net/2017/articles/1/9/0/4/0/8/5/nintendo-switch-wired-headset-looks-like-a-faff-1496331074038.jpg/EG11/resize/300x-1/format/jpg/1904085.jpg)
In that case you'll need something which looks like this - Hori's officially-licensed Switch chat headphones (thanks, Nintendo Life).
The headcans themselves plug into a splitter device, which you can use to control volume. From there, you'll need to plug one cable into your Switch's headphone jack, and then another into your smartphone headphone jack (or, if you're on iPhone 7, you'll need a headphone adaptor).
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