@sponka it appears Jolla have gone for the more widely used US standard for headphones than the OMTP standard Nokia used to use. Nokia themselves also ditched OMTP in the latest Lumias.

The USB charging standard states that the two middle pins in the connectiin have to have a resistor connected or just shorted. This is what Nokia followed in the N9, N900 etc. Apple on the other hand decided to put a voltage across the two middle pins to tell it's products if the charger is compatible. Most 3rd party chargers follow the Apple rules. You can buy adapters that fit inline converting to the USB standard on ebay.

It's kind of sad that the standards were rolled over by the Apple accessory market but on a practical basis great that Jolla have realised which way the wind has blown.