Yeah sms/calling over LTE does not work
. The good news is it's very fast/smooth. It runs on CM's kernel so its fast at least. It's a first build so I'm sure this will get fixed soon, in fact this is the first official nightly of carbon rom.
Edit: also very strange proximity sensor bug...if you cover the sensor with your hand even just a little bit it will shut the screen off and right when you move it away from the sensor it will turn back on. It's strange I have never seen this before I though maybe it was pocket mode, but I unchecked it and it still does it. Oh well its a first release, lots of bugs is fairly normal. Cant wait to see what this looks like further down the road. Love this rom. Right up their with PA for me.