I’ve found other topics which were closed this Summer without a clear solution, so before contacting support by mail I’m trying to open a new one.
I own a brand new FP2 and a Urban Ears Plattan 2 Headset.
According to the Compatible Headset Wiki it is supposed to be compatible.
The headset worked very fine on my previous phone, Samsung A3 (Android).
The headset microphone has the issue that it stops working in the middle of a call, after some 10 seconds, or sometimes even from the beginning. It happens on every single phone call, whether I call or I’m called.
I have tested the headset microphone using a recording app, it worked very fine for a full minute.
I have no problem with the integrated headset, or with the car bluetooth connection, or with a portable bluetooth connection.
I can hear music and the phone calls from the headset without problems. The control button (play/pause, call pickup/hangup) works very fine.
I have Android 6.0.1 and Fairphone OS 17.10.2.
Tips and advise are very welcome.