Hi Colua
There is a wired headset with a microphone that you can use to make calls and listen to music.
Folding during a call is also possible if you have deactivated the "automatic end of call when folding" function.
Have fun!

I often make calls with headphones while the phone is folded. This worked without a problem from the beginning. That means I haven't changed any settings (just turned off the apps whatsapp ect).

(connected headset, not completed...🙄)