I see a lot of people complaining that the Fairphone 6 doesn’t have an Aux jack.
Just use an adapter cable.
A 3.5mm Aux jack takes up a significant amount of space just to connect a few wires that could be connected through USB-C anyway, that space could be used for a bigger battery.
Even if there was a good enough reason to keep Aux it should be 2.5mm Aux and not the usual 3.5 as it does exactly the same thing but uses less space
In this case you can invest 7 bucks in a good splitter.
I have two and they have had endless connection issues. Also, the DAC in splitters is terrible, so this requires a USB-C splitter followed by an external DAC. It’s pretty unwieldy.
Also, on my previous phone without a jack the USB-C port started having charging issues after a couple of years due to wear. I’d be less annoyed about it if they had multiple USB-C ports, but a single port device is a bad idea in general.