I have had a Volla Phone for 1 week and I seriously played with it. I tried VollaOS, UT and finally Sailfish. I really liked Sailfish, especially after the Telegram app, which works great. I still have two problems to deal with - hotspot and Viber. If I can handle a hotspot, I can swallow Viber's absence. I travel a lot and I need a hotspot to be able to use my laptop.