usb-c to 3.5mm adapters are not well supported on sailfish os, in phone calls they just don’t work. but for android apps they worked, like for whatsapp, as in whatsapp calls. that was on xperia 10 ii or xperia xz2 compact. some phones don’t even have support for that, like the xperia 10 iii doesn’t even support this adapter on sailfish os, audio just isn’t routed through the dac. with the c2, xperia 10v or f(x) tec 1 pro x i didn’t even try a dac.
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