I was on with the 2nd level tech today re poor signal strength. After the issue was finished we were chatting re turbo/lollipop. He said 5.1 ota pushing 6/1/15 and will also include WiFi Calling feature. I know, we've heard all this before but he was very positive. Don't come looking for me if it doesn't happen. Actually this was first time I have heard anything re WiFi calling.