Sounds like you want usb type c! In addition to Audio Adapter Accessory Mode which allows it to drive a couple pins with analog audio exactly like the 3.5mm jacks (and therefore enabling completely passive adapters to support devices with 3.5mm jacks), usb type c also supports charging, high speed data, and video. That's a lot more universal than some silly jack that can only support audio.
Unfortunately it looks like at least the fairphone 4 didn't support Audio Adapter Accessory Mode and I haven't found information on whether the fairphone 5 supports it. Definitely a mark against the company if they don't support Audio Adapter Accessory Mode.
Sounds like you want usb type c! In addition to Audio Adapter Accessory Mode which allows it to drive a couple pins with analog audio exactly like the 3.5mm jacks (and therefore enabling completely passive adapters to support devices with 3.5mm jacks), usb type c also supports charging, high speed data, and video. That's a lot more universal than some silly jack that can only support audio.
Unfortunately it looks like at least the fairphone 4 didn't support Audio Adapter Accessory Mode and I haven't found information on whether the fairphone 5 supports it. Definitely a mark against the company if they don't support Audio Adapter Accessory Mode.