INFO!!! fairphone DOES SUPPORT CUSTOM ROMS!!!
i like the idea of a fairphone. i dun wana buy one tho - if it doesn hav the features i need/wan.
if fairphone had all dis stuff - it would hav a genuine moat, besides the sustainability stff-
alternative image link (blahaj zone)
However, 3.5mm to USB-C adapters are not passive, they’re active. They need a DAC (Digital to Analog Converter) to generate audio signals from the digital data stream that comes from the USB-C.
Phones didn’t use to have very good DACs (with exceptions, of course), but they’re still normally better than whatever you get from a 3€ adapter.
Adapters are also less convenient than a headphone jack, because now you need to remember taking the adapter and the headphones with you.
There are entirely passive adapters, but they’ll only work if the phone has the necessary hardware of course.
USB is digital, TRS is analog. All adapters must have a DAC (digital to analog converter) to make that transition. DAC requires power, making it active. DAC in phone will be higher quality to convert to analog. DAC in cheap adapter will be low quality.
Or, you wire the output of the DAC in the phone up to the USB C port and enable them only when the connected dongle announces it supports “Audio Adapter Accessory Mode” that lets the phone pass the analog audio signal through directly.
It has mostly fallen out of favour though, as it’s become easier to just stick the DAC directly in the headphones (Or speakers etc.) and keep a purely digital output path.