10.2 was terrible for me, no echo and no call drops, but often people said they have troubles to hear me, often I had messages that someone tried to call me and I was not accessible, later I found out that indeed I can't call myself from other phone. Data connections were poor. Maybe this can work in other countries, but here in Poland it was unusable
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Now I'm on latest weekly.eu ROM, it's much better - people can hear me and I'm rather online, but I still have some issues regarding quality - one call was dropped, once I could hear every second sentence. Still it's just faulty but seems to be better than that from stable. I still hope they will fix that!
Phurya: I expect that it may work better in different countries, some carriers support different technologies. I never had issues you described like echo, but I had other problems. BTW: is VoLTE working on your side?