A bit of venting from me, but I hope sound quality via 3.5mm jack will be great on Jolla phone.

Haven't had a proper sound quality on a phone since iPhone 4 and N8. I'm a bit anal about my sound quality, but my Lumia 920 and Sony Xperia Z have turned me totally off from listening any music on a phone. Frustrating.
Samsung seems to be the only one that cares with its Exynos SoC on GS4 having Wolfson DAC. Shows how the move to such a monotony and lack of surprise on hardware (every other manufacturer uses same Qualcomm SoCs) has resulted in such a mediocre devices in some aspects with really not all that much a difference between them when you dig deeper. No N91 kind of devices that's hardware was totally out there. At least Samsung is trying.

I would pay a lot for a higher end mobile amp/dac + extra battery on the other half if it will be possible